Best Switch Usb Fans in 2026

#1 Bestseller from Amazon Germany: SONNENGLAS is the Original and only Solar Lantern invented and made in South Africa in a Fair Trade Project. Sustainable and fully powered by the sun. RED DOT Design Award Winner | Award for Best Design for Social Good

24 hours of bright light | Genius Magnetic On/Off Switch | Intelligent Day/Night Sensor | LEDs give warm, indirect, magical light (3500K)

Micro-USB Charging Option for year-round use | Indoor and Outdoor usage | Use as a reading light on your bedside table, garden light, for barbecues, as hurricane light, during emergencies or simply as beautiful decorative indoor and outdoor lantern

【Exquisite Design】ONLY 6 oz! Compact lightweight design for maximum convenience. Small and lightweight personal fan provides cooling air circulation in any desired directions with 360 degree tilt rotation.Perfect for use in home,car, office, desktop, camping, or travel.

【Ultra-Quiet】The small usb desk fan uses a silent structure which is engineered to be ultra-quiet while delivering high airflow. Better accompany your work or sleep without disturbing you.

【Three-speed Adjustable】 Low/medium/high speed level. Adjust appropriate fan speed by pressing the power button repeatedly. Third gear which can be variable speed design provides you more choices in different temperature environment.

【Exquisite Design】 JZCreater small portable fan is compact and designed in unique modern look, lightweight and space-saving. It weighs about 160g which is very convenient to carry，suitable for home, office, desktop, car, camping, travel use or gift.

【Ultra Quite】Feature with brush-less quiet motor, which makes the mini fan run quietly yet blow strong airflow. When in use the fans sound is lower than 50db at the high speed. The switch indicator will auto turn off after 30 seconds, power saving, soft wind and bass provide a good sleeping for baby.

【3 speed Adjustable】This small desk fan provides you low/medium/high 3 speed levels to choose. Select the appropriate fan speed by pressing the power button repeatedly. It has a self checking function not found in many of the similar products in which the fan will run for 2 seconds to check during excessive power flow.

【Strong Wind】The inbuilt first- new copper made brushless motor is stronger and have longer lifespan than regular motor, which can support the blades run at high speed to produce powerful wind, the front cover have a fluid- mechanical design that can maximize air movement, the Aluan desk fan would be your best partner during the hot summer.

【Compact Size & Exquisite Design】The 6inch portable fan is compact and designed in unique modern look, lightweight and space-saving. Perfect personal fan for office, home, bedroom, desktop, camping, or anywhere you need to make your day cool.

【Speed Adjustable】The portable fan with 2 adjustable speed is adequate for your various cooling demand, just press the power button to change the speed, it will always keep you cool at the low speed, the high speed is strong enough to cool you down quickly after heavy sweat.

【Stay COOL Anywhere Anytime】 Feeling hot? You need to go outside but also have no hands to hold regular portable fan? Why not always stay cool with this wearable neck fan? You can hang the fan around your neck and take it everywhere, will not feel tired or uncomfortable. Say goodbye to hot flashes, sweating, and flushing.

【Hands-free Design & Stylish 】 The neck fan is designed to sit comfortably around your neck, allowing you to keep your hands free while enjoying a cool breeze. With its vibrant LED light and sleek design, this portable neck fan is not only functional but also stylish, and it's perfect for outdoor activities or working in a stuffy office, this necklace fan will keep you feeling refreshed and cool. The colorful LED light adds a fun and stylish touch to your outfit, making it perfect for concerts, festivals, or outdoor parties.

【3 Adjustable Speeds & long-lasting Use 】 Equipped with 3 adjustable speeds, the neck fan offers customizable airflow for your ultimate comfort. The built-in 4000 mAh battery ensures long-lasting use, while the one-button control makes it easy to switch between light and blow speed.

【78 Air Outlets Cooling】 Wowgo Bladeless neck fan there are 78 air vents in total on sides and at the rear, which can achieve an omnidirectional air outlet and feel cool quickly in 3 seconds. With bladeless turbine design ,prevent your hair from being rolled into the fan blades ,ensuring safely used by long hair people, children and the elderly.

【Low-noise And Comfortable Design】Our hands-free personal fan with a brushless motor and designed dual-channel air intake to ensure low noise when it works and won't bother you to use. It is made of food-grade TPE material that is better than ABS, which is more flexible and free adjustment to hang around your neck, wear more cool and comfortable, safe, reliable, and durable (Weight 9.8 Oz and NO burden on your neck).

【LED Lightening & Fashion】-- It is upgraded with led lighting fan. Long press the switch for 3 seconds, the light will be activated and change color automatically，make you look cool and fashion to wear when traveling especially in night ,as an ideal and premium gift for girls, friends, families take it anywhere in hot weather.

FEEL THE BREEZE - Single speed setting, 4 blades and simple operation with manual on/off switch

USB-POWERED - Includes micro-USB cable for simple connection to power fan from a laptop or outlet adapter

DURABLE CONSTRUCTION - High-end metal finish provides a classic vintage look

Ultra-quiet UL-certified USB fans designed to cool various electronics and components.

Features a multi-speed controller to set the fan’s speed to optimal noise and airflow levels.

Dual-ball bearings have a lifespan of 67,000 hours and allows the fans to be laid flat or stand upright.

🔴【Newly upgraded 350-400 RPM/min】: The rotation speed of the Redeo fly fan is increased to 350-400 RPM/min, which can drive away annoying flies and insects more effectively than other fly fans, Keep for Your Food Clean; you can stop using stinky sprays, nasty flypaper and useless candles for an eco-friendly.

🔴【Soft Blades & Whisper Quiet 】: These soft-touch blades are extremely flexible and designed to stop instantly on touch. Enjoy peace of mind without worrying about your hands, kids, or pets getting hurt. It works with almost no noise, creating a quiet dining environment for you.

🔴【USB Rechargeable and 2 AA Batteries Included】:The Redeo Fly Fan for Tables includes a 1m USB cable to charge it anytime, or you can use the included 2 AA batteries for up to 48H of continuous use without worrying about power issues. The fuselage is 9 inches high and can be placed on a desktop or suspended.

❅ Small Size & Portable Fan ❅ Designed with the anti-slip handle, Pluralla personal fan is very easy and comfortable to hold even by small hands. Comes with a stable base and lanyard, you can put it on desk or hang it on you neck outdoor. The base includes a phone holder design, which is convenient for you to place your phone and watch movies and videos coolly.

❅ Powerful Wind - 5 Modes ❅ Built-in optimal copper DC motor, effectively reduce carbon brush friction noise, Pluralla portable fan provides 5 different wind speeds for you. You can simply press the power button to switch the wind setting, from weak to strong, powerful and quick enough to cool you down no matter indoor or outdoor. Special Note: In order to protect the motor to extend the service life and save energy, the fan will automatically shut down after continuous using for 4 hours.

❅ 3000mAh Rechargeable & USB-C Charging ❅ This mini fan built in 3000mAh rechargeable battery that can provide you up to 7-12 hours of continuous working time. Comes with the USB-C charging cable, you can charge it for about 3-4H by the regular socket, power bank, computer, etc.

🎐【Updated Quiet Desk Fan】:The 6-speed design provides you more choices in different environments. The first-speed is an energy-saving and environmentally-friendly mode, 5 seconds to turn on and 5 seconds to turn off. It only takes 3.5h to charge the 5200mAh high-efficiency lithium battery, and it can work up to 6-48h

🎐【Quiet Oscillating Fan】:Air circulator fan can be set to switch between 30°-60°-90°-150° automatic rotation angle. Accelerate the air circulation in the indoor environment and bring you a cool breeze.The noise of the super silent fan is between 20dB-55dB. It is a quiet and good friend when working and sleeping. Ideal for your desk, office bedroom use. Personal fans for home bedroom

🎐【7 Inch Small Desk Fan with Timer】:Timing fan can set the working time of 1-2-4-6Hours. If you often worry about catching cold after going to bed and getting hot before going to bed, fan with timer can solve the problem for you. It is easy to operate, and it brings you coolness without worrying about forgetting to turn off the power

❤【Smaller Than Your Cellphone】Mini Hand held fan Sized 2.9×1×5.1 inch. It is fold up by the pull-out style so as to reduce dust intrusion.Taking up minimum space; weighting only 125g, fans that fit in your purse and convenient to hold in hand or take along.

❤【Powerful Airflow of 3 Adjustable Speeds】Built in premium motor and 7pcs fan blades, handheld fan strong wind offers you lower noise but higher speeds—you would feel cool 2m away from it. Simply switch its airflow between low, medium, and high on your needs.

❤【Elegant Design Stands You Out】The unique appearance as a perfume bottle of the small portable fan travel makes it outstanding from others. The blades can be hidden up internal for ornamentation, which makes it a rather nice gift for you and your friends.

【Flexible Tripod】This mini baby stroller fan has a unique flexible tripod with a new version upgraded silicone surface, instead of plastic and sponge surface, which makes it waterproof, and avoid getting dirty, easy to clean, less prone to aging, and breakage, more durable, safe and health for you and your baby. You can bend any angle you want to set up various forms: stand as a desk fan, handheld as a mini portable fan, hanging or winding as a clip on fan, even as a phone holder.

【Versatile and Portable】 Since this portable mini fan is bendable and compact and lightweight, you can easily put it in your handbag or backpack. It will be your good companion in outdoor travel, cycling, hiking, climbing, camping, and other activities. You can also clip it on the stroller, bike, treadmill, crib, car seat. Let you feel cool in the hot summer, any time and any place.

【Quiet and Powerful】With one button to switch between 3 different wind speeds, you will find the perfect speed for you. Most importantly, the motor is very quiet, so you never have to worry about your baby being woken up and ensure your baby has a good sleep. The ultra-fine mesh design effectively prevents the baby from touching the fan blades to avoid injury. Sturdy and fall-resistant, non-toxic and odorless, safe for children to use.

【2023 Upgraded Safety】Portable USB Rechargeable Battery Mini Stroller Fan is Made of Upgraded Bendable Metal And Silicone Surface. Compared to The Old Version of Plastic And Sponge Surface, it is Easy To Clean, Avoid Dirt and Waterproof.It is Easy to Fixed And Provides Your Baby With Longer Cooling Time.You Can Bent Any Angle You Want, Grip it, Wrap it, Stand it, Keep it Durable, Flexible And Stable.

【Multifunctional Stroller Fan】The Stroller Fan Has a Built-in 5200 mAh Super Long Life Rechargeable Battery,Which Can Be Quickly Charged Through USB,3~8 hours Working Time (depends on speed). Handheld Portable Clip on Stroller fan Has a Tough And Durable Tripod. You Can Bend It at Any Angle According To Your Imagination to Create Various Shapes, Such as a Handheld Fan, Desk Fan, Hanging Ffan, Carseat Fan And Even a Mobile Phone Stand. Meet all Your Cool Needs in The Hot Summer.

【Ultra Quiet & Baby Friendly】One Key To Switch Between 3 Wind Speed Modes, You can Find The Wind Speed for The Right Baby. The Ultra-fine Mesh Design Can Prevent Your Baby's Fingers From Touching The Fan Blades And Avoid Injury. The Upgraded Motor Makes The Noise Generated By The USB Fan Very Small, Allowing The Baby To Sleep Peacefully Without Waking UP.

【Trendy Morandi Color, Create Your Own Summer Vibe】 JISULIFE newest handheld fan is coming up with trendy morandi color, which makes it elegant and special. Savor your summer with JISULIFE handheld fan, an small item which can greatly improve your cooling experience in summer. Perfect choice for outdoor/travel/commute/party.

【3 Wind Speed Gears】 JISULIFE handheld fan supports 3 wind speeds adjustment easily by 1 button. Speed 1 is light wind for about 10 hours, Speed 2 is soft wind for 7 hours, and Speed 3 is strong wind for 3 hours.

【Rechargeable Battery】With a built-in durable battery, can be easily recharged through a socket/laptop/power bank or any other device that has a USB port. Just 2 hours will get fully charged. (NOTE: Quick charge needs to be meet 5V/2A current.)

【Rechargeable Fan with Timer Switch, Incredible 60 Hours of Battery Life】We are the only baby stroller fan with timer setting. Our battery powered fan built-in 12000mAh battery, 3 adjustable high-medium-low wind works 12hrs-30hrs-60hrs. Combine with the timer switch(2/4/6 hours), auto turn off the small fan in time to save battery, so you will feel like this usb fan can work forever indoors and outdoor. 5V-2A fast charging helps the cordless stroller fans can be fully charged within 6 hours!

【Used As Portable Charger, Lightweight and Practical】Built-in 12000 mAh powerful battery capacity, you can use it as a power bank that provides the backup power source for smartphone. Its compact mini size brings you the most convenience in personal usage. What You Get: 1 x Stroller Fan(Black); 1 x USB Type-C Cable; 1 x User Manual.

【Mighty Yet Quiet Brushless Motor, Improved Cool Airflow】This 5.5 inch desk fan uses a professional high-performance brushless motor with a speed of up to 5200 RPM and a low noise level of 10-35db. The lowest grade wind is gentle and quiet, stand or clip on fan for bedroom, crib; mid and high grade wind is strong, perfect rechargeable portable fan for Disney trip, outdoor golf cart, beach, treadmill, dog wagons.

❄【Ultra Quiet Personal Fan】-Want to cool down on a hot summer day without annoying background noise? This table fan euipped with the latest 2.7W*2 brushless motor and ultra-thin blades, make sure that the noise of this table fans for bedroom is lower than 30 dB, which is considered whisper-quiet. The quiet table fan will provide ultra-strong airflow at the lowest noise, so you can feel the cold air comfortably when you are in the office, home bedroom or anywhere.

❄【Super Powerful Cool Fan】- Adopts high-performance motors and upgraded fan blades, the table fan can promote circulate air throughout your whole room which is faster than traditional desk fans. 90° tilt adjustment can help you find the best angle, whether lying on the sofa or in bed. 90° swing allows everyone to enjoy the coolness. Combining fans with air conditioning or other air equipment not only increases freshness, but also saves additional energy in summer.

❄【Upgraded Auto Oscillating fan】- The oscillating fan for bedroom with 180° rotation adjustment(90° Auto Oscillating and 90° Manual Oscillating), is good for effective air circulation, bringing you cool and fresh air. When the oscillating fan is on, press the knob to turn on the oscillating head, and press again to turn off. With this 2023 New oscillating desk fan, no longer worry about headaches or getting cold caused by prolonged directly blowing cold wind.

Clip Fan【2-in-1 Fan】: ATEngeus USB Fan is not just a Desk Fan, with a strong 3-inch clip makes it a clip fan, can be clipped on treadmills, bedsides, golf carts, equipped with 10000mAh battery, It suitable for traveling and camping.

Stroller Fan-【4 Speeds Adjustable】: The Clip Fan has 4 speeds. The Rechargeable Fan with a brushless motor has a stronger airflow, which can meet your demand for any wind power. The switch has a memory function. When you press and hold the power button to turn it off, it will start up next time When the fan is turned on, it will return to the original wind speed gear.

USB Desk Fan-【720°Rotation】: The Portable Fan can rotate 360°vertically and horizontally, and can flexibly adjust different angles to meet the blowing needs of different positions. The noise is low, and the Stroller Fan can keep quiet even when it is sleeping. You won't be disturbed by noise.

【Do you feel hot and dry due to the hot summer? 】EasyAcc Desktop Fan, with a maximum speed of 2000RPM, provides you with super strong and cool wind, and you can still feel a strong cool feeling within a distance of 2m.

【Are you disturbed by noisy fans while sleeping or working? 】The latest power technology, DC motor, low power consumption and low noise, the wind is soft and quiet, and the sound is still lower than 40 decibels at the fastest 4th wind speed. Consumes just 2.5 watts per hour and enjoys peace of mind while working, studying or taking a nap. Lower power consumption, environmental protection and energy saving. Provides continuous wind power. Its features are appreciated by most of the clients.

【Are you still worried about the harmful substances contained in metal materials?】：This desktop fan features a durable metal mesh frame with welded and polished seams to provide a stable base, thanks to the galvanized metal surface that ensures this desktop fan will never rust and the high polished bronze finish will never fade. Does not contain any harmful substances, can be used with confidence.

【Powerful Wind & 4-Speed Adjustable】QQT cute portable handheld fan is built with a new copper motor, highly efficient brushless motor with hydromechanically designed 7 fan blades, which can produce strong breeze at very high speed with excellent cooling performance. 4 adjustable wind speeds allow you to control the airflow from natural, slow, medium and fast according to different needs.

【High Performance Battery】Portable battery-powered handheld fans can give you the blessing of summer with the QQT's latest high-performance battery. It provides you with 20 hours of maximum continuous working time depending on the wind speed. The working life is 5-7 times longer than most mini fans and has been tested several times in the lab to ensure 6-20 hours of operation (depending on the gear) on a full charge.

【Creative Design】 This is both a portable rechargeable hand fan and a mini fan for your desk. The ergonomic handle of the fan allows for a perfect grip, so you can use the handheld fan when you are outdoors, just open the cover on the handle to switch the use mode, place it smoothly on your desk and enjoy the cool breeze.

【3D Vision Effect】Magic 3D Led lamps play tricks on your eyes, It’s an optical Acrylic flat board in actual, with laser engraving. Especially looks like a real 3D night light in the dark or take a photograph, the vision thrill will be strong! Sleep with the super hero night lights on can help you fell safe at night.

【Remote &Touch Control】Control 16 colors change,automatic changing. Night light can be changed 16 colors and 4 modes brightness dimmable via remote, which fit for different occasion. USB connected or 3-AA batteries powered(not included), low power. Crystal acrylic plate non-toxic and tasteless.

【Room Decor Aesthetic】Unique lighting effects amazing optical visual illusion home decor lamp, It makes your room decor more interesting. It’s easy to control the kids night light even when you are lying in the bed.

【8" Foldable Standing & Table Fan】unique folding & telescopic design, mini size, 8" in diameter, 4.1"/40" in height when folded / stretched, lightweight (net weight: 980g) & mini size, easily moved among your rooms, carried outdoors in backpack, could be used as desk fan, pedestal fan, floor fan and stand up fan, easily meet your different needs for fan's height.

【Oscillating Fan with Romote Controller】60° smooth oscillating fan, with the remote control (switch, timer, oscillation, speed function), you can easily control your personal cooling fan as you like, bringing coolness to you and ones around.

【Super Quiet Fan with 4 Speeds】4 levels wind: breeze wind / soft wind / strong wind / natural wind mode, the remote controller adds sleep mode, super silent 30~40db, allow you to enjoy a peaceful sleeping.

NECKLACE FAN - NOW RECHARGEABLE! The best-selling hanging neck fan from O2COOL is now fully rechargeable, no batteries required! Easily charge it with the included micro USB charging cable. Light flashes while charging. Once charge is complete, light stops flashing.

VERSATILE 3 SPEED CONTROL - The new & improved portable neck fan features three speed settings that let you adjust from a light breeze to a strong wind! To change the speed settings, use the On/Off switch to toggle through speeds: Low, Medium and High.

POWERFUL VERTICAL AIR FLOW - Engineered with a powerful three-speed vertical air flow that directs cool, refreshing air upward towards the face and head. Ultra slim profile and light weight make this rechargeable neck fan discreet and nearly unnoticeable.

【Is Your Router Overheat Easily ?】 It reduced the temperatures of your router by a substantial amount. Whereas before the thing was almost too hot to touch at full load, it will be almost cool after you got this item. Network speeds are commensurately increased. Temperature reduction provides an expected longevity extension and higher performance of a critical network component. These fans are overall very helpful for devices that get a bit hot and start to throttle down.

【Environmental & fireproof Material】The fan has a USB connector, Added dust filter between units. Speed selection switch is very durable, long life with 5-Years.

【Variable Speed Controller】 The variable speed is great for turning the speed up or down to your noise comfort level. It is cycles from high-Medium-low and off speed mods. Enables the fan to be powered through an AC outlet.

Portable battery fan ▶ 【One-touch shutdown & smart chip】 This portable smart fan does not need to be turned off by pressing the airflow control switch from low to high 5-6 times. Just press and hold the power button for 5 seconds and it will shut down directly. Compared with similar fans in the market, the chip function is fully upgraded.

Battery powered fan for camping ▶【10000mAh & Dual charging ports】 We designed this 10000mAh practical model fan according to market demand, (4-speed wind) Can work 24h at low speed. With USB-C and Micro USB dual charging ports, you don't need to charge frequently or worry about the mismatch of the data cable, the indicator will tell you the remaining battery power.

battery operated stroller fan ▶【4-speed wind speed & 30-60dB low noise】 Smart 4-speed wind speed , easy to set, strong, natural and quiet. The minimum and maximum wind speed modes operate at 30dB to 60dB respectively, quiet airflow is essential to ensure your family can enjoy a good night's sleep without any disturbance, support charging while using, full and stop.

Portable battery fan ▶【One-touch shutdown & smart chip】 This portable smart fan does not need to be turned off by pressing the airflow control switch from low to high 5-6 times. Just press and hold the power button for 5 seconds and it will shut down directly. Compared with similar fans in the market, the chip function is fully upgraded.

Battery powered fan ▶【5000mAh】We designed this practical 5000mAh fan according to market demand, which can work for 18 hours at low speed. Suitable for studio, bedroom and outdoor camping, The 3-speed battery-powered fan provides you with more options in different temperature environments.

USB rechargeable fan ▶【3-speed wind speed & 30-60dB low noise】 Smart 3-speed wind speed , easy to set, strong, natural and quiet. The minimum and maximum wind speed modes operate at 30dB to 60dB respectively, quiet airflow is essential to ensure your family can enjoy a good night's sleep without any disturbance, support charging while using, full and stop.

【New Upgraded Portable Neck Fan】- MSEVC Latest version personal neck fan upgraded the airflow and noise reduction function.The wearable neck fan got more powerful airflow and low-noise which keeps your cooling always.With 6000mAh bartteries and four turbine motor design,it will last longer and provide high-velocity wind.Safer than those before and don't worry about your hair being caught or dust,sweat enter the neck fan.Ideal choice as a companion for working in the hot summer.

【3 Speeds Modes & Hand-Free Design】This hand-free neck fan equipped with 3 adjustable air volume setting(Weak,Natural,Strong).Easy to switch by the independent button.You can switch to two or four turbo motor depend on your needs. Just 36 airflow outlets enough to 360° surrounding cooling air supplied. Ultra-light design 8.74 oz weight and Skin-friendly ABS material,80°~150° adjustment angle range,putting less strain on the neck.Give you the best experience in a quiet and comfortable environment.

【360° Powerful Airflow & Low-Noise】Benifit from Four Turbine Motor and Twin Ducts on each side,MSEVC Bladeless neck fan produce strong wind that is powerful than others.And the noise lower to 25dB.It won't disturb you when studying,working,sporting or traveling etc.

Powerful whole room circulation: Using Dreo's WingBoost technology, this air circulator fan delivers far-reaching winds that go as far as 70 ft, while bringing a massive 343 CFM of air volume, ideal to move air efficiently at bedrooms, living rooms, office, etc.

One fan, multiple functions: This quiet fan not only can help you move air across the room, but also replace your traditional fan; with 4 wind speeds, Auto mode, your new air circulator is ready to cool the way you want it.

Bring the air where you are: The 120° tilt let you find the best angle, whether you are in laying in the sofa or in your bed, while the 90° oscillation let you surround yourself in coolness; you can also combine it with your AC and other air appliances for extra energy savings during summer.

Convenient USB Fan: The USB plug can supply power to the fan through the USB port on the back of popular audio-visual electronic equipment and game consoles.

High Quality: The double ball bearing has a service life of 65,000 hours, and the 7 blades generate strong airflow to keep the cabinet cool.

Three Speeds: Silent fan features a multi-speed controller to set the fan’s speed to optimal noise and airflow levels. Low gear (L), middle gear (M) and high gear (H), the noise is only 21dB in low gear.

[ THE ULTIMATE PORTABLE TRAVEL FAN ] Enjoy cool, crisp breeze & stay cool in the sun with our Multifunctional camping Fan, featuring desk fan, tripod fan & hanging modes, integrated power bank & wider fan diameter to work as a tent fan to powerfully circulate air, keeping you cool & comfortable whether travelling in hot cars as a battery operated fan, or relaxing under summer sun as a pefect size outdoor patio fan!

[ HANG, STAND OR PIVOT FOR PERFECT COOLING ] Perfect for freestanding, desktop & hanging tent fan use, our outdoor fan for travel features a 3-speed, 12W, powerful, quiet brushless motor with detachable stand/floor tripod & 270 degree adjustable handle that can be easily used, as a tripod fan, or hung at your tent’s top for quiet, all night cooling!

[ INTEGRATED 8000MAH POWERBANK ] Great for charging laptops, cell phones & other camping essentials when used as a camping fan, our desktop fan uses a super-high capacity 8000mAh battery that can easily double as a battery operated fan with power bank with USB & USB-C ports, powerful enough to run our USB fan for a day on a full charge!( The duration of use needs to be combined with the frequency of use.)