Best Samsung Usb Hubs in 2026

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Massive Expansion: Get way more out of your laptop’s USB-C port with 4K@30Hz HDMI, SD card connectivity, USB-A / USB-C data ports, as well as high-speed pass-through charging with Power Delivery.

Powerful Pass-Through Charging: Compatible with USB-C Power Delivery to provide high-speed pass-through charging to your laptop at up to 85W.

【Instant expansion and SuperSpeed Syncing】-This 7-port USB 3.0 data hub can instantly expand 1 USB 3.0 port to 7 external USB 3.0 data ports for keyboard, mouse, printer, hard drivers and more USB devices, syncing data at blazing speeds up to 5Gbps in no time.

【Smart Charging Port】- Besides 7 SuperSpeed USB 3.0 ports, this USB 3.0 splitter offers a charging dedicated port, which is able to charge your iPhone, iPad faster and safer. With the 5V/4A power adapter, it can provide charging power up to 2.4A .

【Simple Switch to Control】- Equipped with individual on-off switches to control each USB port, atolla USB 3.0 hub saves the trouble of unplugging devices and help place them more rationally when you don't use them.

👍【USBC Hub 11 in 1 Powerful Expansion】 USB-C Hub Large expanding to 11 ports of your computer/smartphone. 1 x 4K @ 30Hz HDMI output port +1x1080P@60Hz VGA output port+ 100W PD charging port + 1Gbps RJ45 Ethernet port + 1 x SD card reader / 1 x TF card reader + 4 x USB-A 3.0 ports+3.5mm Audio. Just plug and play. Create an efficient, convenient and stable workspace.

👍【4K High Definition & 100W PD Fast Charging】 Type C hub allows you to convert a large screen. Support mirrors and extended modes. Supports 4K (3840 x 2160) video and data transmission. Including backwards compatibility, it supports stable HD resolutions such as 4K@60Hz(Only support VGA output port),4K@30Hz, 2K@30Hz, 1080P, and 720P. Comes with a PD rapid charging port, so it can also be charged when video output.

👍【1Gbps Stable Internet】Macbook USB C hub ethernet adapter Equipped with an Ethernet LAN port. Connect to the internet and enjoy high-speed 1Gbps connection. Convenient USB-C lan, which allows you to seamlessly watch videos online or send files.

ALL THE ESSENTIAL PORTS - features 4K HDMI (60Hz), USB-C PD charging (up to 60W), two USB-A 3.0 ports up to 5Gbps, micro/SD card readers. Simply, plug and go with no extra drivers or installation required.

USB-C POWER DELIVERY - includes enhanced USB-C PD charging protocol for more efficient charging speeds (max 60W) and power management. Requires USB-C PD (2.0 or higher).

MICRO/ SD CARD READERS - features a micro and SD card readers for simultaneous read/write speeds of up to 104 Mb/s. It will only read one card at a time. Supports UHS-I, SD/SDHC/SDXC.

DESIGNED FOR IMAC - exclusively designed for iMac Pro and iMac (2017 & later) models with Thunderbolt 3 ports. Not compatible with older iMac models with standard Thunderbolt ports. Does not fit latest 2021 iMac.

EVERYTHING WITHIN REACH - quickly adds USB expansion ports to the front of your computer for convenient access to all your devices.

USB-C CONNECTION - securely plugs into your iMac's Thunderbolt 3 port via 6-inch shielded USB-C cable. Use the adjustable knob to fasten the hub to the bottom of your computer.

High-Speed USB 3.0: Four USB 3.0 ports can transfer data at a super speed rate of up to 5Gbps. 10X faster than USB 2.0. Transfer HD movies, photos, songs and large files in seconds.

Plug and Play: The USB C hub adapter expands the single type C or Thunderbolt 3 into four standard USB 3.0 female ports. Plug and Play. No driver and software are required. The type c to USB hub is not recommended for charging phones or tablets.

An extra USB C to USB Adapter: This product includes an extra USB C to USB adapter. It turns this USB-C hub into a USB hub for devices with USB-A ports built-in. This adapter supports a stable charging speed, up to 5V/3A, 9V/2A. You can use it alone or with the USB C Hub. The adapter only offers USB 2.0 data transfer speed of up to 480 Mbps. If the USB C hub is used with this adapter, it can only support USB 2.0 but not USB 3.0.

【6-in-1 USB C Hub】UGREEN 6-in-1 USB C hub features a 4K HDMI output port, SD, and TF card readers, and 3 USB 3.0 ports. All hub ports can work simultaneously and save you the trouble of plugging & unplugging repeatedly.

【HDMI Port for 4K UHD Visual Feast】Mirror or extend your screen with USB C hub multiport adapter to directly stream 4K UHD, Full HD 1080p, or 3D video to HDTV, monitor, or projector. You could not only enjoy movies with your family on a bigger screen but also make a vivid presentation in a meeting.

【5Gbps Superspeed Data Transfer】This USB-C hub adds 3 extra USB 3.0 ports for connecting multiple USB peripheral devices such as flash drives, hard drives, keyboards, mice, printers, MP3 players, and more. Supports super faster data transfer up to 5Gbps, which allows you to transfer HD movies or files in just seconds.

USB 3.1 Type-C & 3.0 USB Hub Version: The combination of USB-A and USB-C is designed to allow one device to compatible with a variety of apple MacBook pro, mac air, iMac, ps4 pro, surface pro, computers, laptops, and other devices simultaneously. Save users time and equipment costs.

Ultra Slim & Advanced chipset with 2 ft extension cable: With two feet of cable, you can arrange your laptop or desktop workstation for maximum comfort and productivity. Both for desktop pc or laptop setups. Advanced chipset with good thermal design, will not heat even if used for a long time.

4-in-1 Data Hub with High-speed: Every port is equipped with USB 3.0 technology, capable of transferring data at speeds of up to 5Gbps—fast enough to transfer an HD movie in seconds.

【USB 3.1 Gen 1】Full USB 3.0 SuperSpeed data transfer up to 5Gbps, 10x faster than USB 2.0. Transfer files, HD movies, and songs to your USB-C devices in seconds. Designed for data sync not charging. Charging Not Supported

[Power Usage] Charging Not Supported. This USB Type C Splitter is designed for data sync not charging, we recommend you not use it to charge your smartphone and other devices. Also, for a stable connection, please avoid connecting devices that exceed a total of 900 mA.

【Plug & Play】Transform one of your computer ’s USB-C/Thunderbolt 3 Ports into four USB A without any adapter, driver, or software needed. Provides you with maximum convenience. Compatible with USB flash drive, mouse, keyboard, card reader, camera, USB Bluetooth Adapter, hard drive, and many other USB connection devices.

SuperSpeed USB 3.0 Transfer - Turning a USB C port into to 3 USB 3.0 ports to connect with keyboards, mice, USB flash drives, hard disks, or other USB-A peripherals, with a data transfer rate of up to 5Gbps

Use Two Cards Simultaneously - Dual SD/Micro SD cards read and write simultaneously at the speed of up to SD 3.0 speed (UHS-I, 104MB/s). Support SD/SDHC/SDXC, MicroSD/Micro SDHC/Micro SDXC, MMC/RS-MMC and more memory cards

Stunning HDMI Streaming - USB-C to HDMI adapter, mirror or extend your Screen to HDMI-equipped HDTVs, monitors or projectors to deliver high-quality video at a resolution of up to 4K(3840x2160)@30Hz. Backward compatible with 2560x1600 and lower resolutions at 60Hz. It is also downward compatible with 2K@75Hz and 1080P@144Hz

USB Splitter : It is compatible with USB flash drives, cameras, removable hard drives, mice, mouse keyboards, laptop, Ultrabook, notebook or other USB A 2.0 / USB A 3.0 devices, the latest PC and the latest smart devices with USB C ports. ( For Huawei Matebook, Chromebook pixel 3 / 2 )

Type C Expansion : Turn one USB-C port into four USB 3.0 ports. compatible with Apple MacBook Pro air, ipad pro, iMac, Microsoft surface pro 7, Samsung Note 10 9, LG, Google Pixelbook, Dell XPS, Asus, Acer Aspire, Oculus Rift S, Lenovo Yoga, HP

High speed: The 4 x USB 3.0 ports support Up to 5 Gbps data speeds let you transfer an HD movie in seconds.

Convenient Connection - This USB C adapter bridges the gap between USB-A and USB-C to connect older devices to your new USB C laptops

Extensive Performance - With 4 USB 3.0 Ports with wide compatibility including USB cable, flash drive, Mouse, Keyboard, etc

SuperSpeed Data - Turn a single USB C port into four USB 3.1 Gen 1 (USB 3.0) data ports with data transfer rates up to 5Gbps-fast enough to transfer an HD movie in seconds

USB C Dock 7-IN-1: Equipped with 4K @ 60Hz HDMI output, 100W PD charging, 1Gbps RJ45 Ethernet connection, SD/TF card reader and two USB-A ports, Dockteck thunderbolt dock turns your device into a mini workstation, providing you a sleek workspace. NOTE: Before purchasing, please make sure the usb-c port on your device support DP Alt Mode, data transfer and charging.

Crystal-Clear Visual Enjoyment: Mirror or extend your screens and directly stream video to HDTV, monitor or projector with a resolution up to 4K at 60Hz via HDMI port. Give you vivid 3D effect video Sync. Ideal for business conferences, presentations, games. NOTE: 4K@60Hz is only available for devices with DP1.4 Alt Mode enabled

Super-Fast Charging & Stable Internet: The 100W PD port offers continuous power delivery for your USB-C device with max 92W. Up to 1Gbps high-speed wired connection ensures a more secure and stable network performance. A great solution for wireless problems such as dropped signals, spotty connections. Tips: LED lights will tell you if there’s a valid internet connection

Instant Expansion: Add 1 * HDMI port, 3 * USB 3.0 ports, 1 * micro SD card slot, 1 * SD card slot, 1 * 60W Power Delivery Ports to your USB-C laptop — all from a single USB-C port. Tuck this lightweight gadget into your bag or pocket to do a business presentation with your laptop and projector, or extend your desktop screen to a monitor or TV;

INCREDIBLE PERFORMANCE - Transfer and backup your files at speeds up to 5Gbps via 3 USB 3.0 ports, quick and easy access to photos and other media by SD/TF card reader, charging your computer with power delivery up to 60W, streams from your USB Type-C or Thunderbolt 3 device to the external Display with HDMI output slot. The resolutions up to 3840*2160@30Hz, 1920x1080@60Hz (1080p Full HD) including 720p, 1600x1200, 1280x1024 for high definition monitors or projectors;

SUPERIOR STABILITY - Built-in advanced and integrated IC chip ensure the performance stability and reliability. Premium aluminium alloy casing for better heat insulation. Fits snugly with the USB-C ports on your devices for stable signal transfer

【On The Go USB-C Adapter】 USB type-c to hdmi adapter easily expands one usbc port into a HDMI 4K output port, a USB 3.0 port, and a PD port charging for laptop, fulfill your daily use. Slim and portable design with aluminium body provides better heat dissipation, the usb hub allows you to carry it in your bag everywhere, perfect for home-theater entertainment, office, exhibition, presentation, teaching etc

【Plug and Play USB C HUB】The USB Type C to HDMI adapter is easy to use, plug and play, no driver, no software installation required. Simple for use the usb c adapter to connect the device to a HDMI-equipped monitor, projector or HDTV. You can easily switch between Mirror and Extended mode, enjoy great pictures and videos without screen flicker, black screen and snowflakes

【High Definition 4K Video】The usb-c hub provides the high definition images and videos with 4K@30hz resolution on your HDTV, monitors, or projector. It makes possible for you to enjoy clear movies and games on a large screen with families and friends together at home, or do a presentation at the conference room. The HDMI adapter will be a good choice for your daily life and work

【Extended USB C Hub】This type c hub extends your laptop's USB Type-C port or thunderbolt 3 into 4 USB ports(3 x USB2.0; 1 x USB3.0), The USB-C multiport adapter is great for laptops only have USB C ports.

【Allows 4USB Ports Used Simultaneously】USB3.0 supports5Gbps super speed data transfer: Sync files directly among the storage devices, like hard drive and SD card reader. Extra 3 USB 2.0 ports for connecting USB peripheral devices such as flash drive, microphone keyboard, mouse, card reader and other USB devices.

【Compact Size & Concise Style】Compact lightweight and portable enough. Allows you to expand your laptops' capabilities while on-the-go. USB-C hub with a sleek aluminum finish perfectly blend in with your laptop.

【UtechSmart Dual-Core Technology Offer 1 Year Support】 Offer 1 year friendly customer service. Built in advanced dual-core VL817 chip with lower power consumption, quicker heat dissipation and higher data transfer efficiency.

【Temperature Control】 Use the same heat dissipation technology as MacBook Pro to extend the working life and provide an excellent performance. Make it safe and reliable when 6 ports are occupied.

【All-in-one USB C Hub】 Connect to the latest MacBook Pro or USB-C devices with the 6 in 1 USB-C hub featuring an Ethernet port, a USB C charging port with power delivery, a 4K HDMI port, and 3 USB 3. 0 ports. Data transmission speed up to 5Gbps.

[ 4-In-1 Multi-Port USB C HUB ] USB C to USB 3.0 HUB Equip four USB 3.0 ports to extend the functions of these USB C devices like laptops, tablets, and smartphones. Connect to keyboard, mouse, card reader, hard disk drive, etc. This USB C adapter bridges the gap between USB-A and USB-C to connect older devices to your new USB C laptops.

[ High-Speed Data Transmission ] Type C to USB HUB Adapter Achieve fast and stable data transfer with the maximum data transmission rate of up to 5Gbps, enjoying a ten times faster speed than USB 2.0-fast enough to transfer an HD movie in seconds. Ideal for transferring music, pictures, movies, or videos. Type C USB HUB is compatible with MacBook Pro 2021/ 2020 iMac, Google Chromebook Pixelbook, XPS, Samsung S21/ S20/ S10 & More USB Type C Devices.

[ Plug and Play ] Connect the HUB adapter to Type-C devices, and it gets ready for use instantly with no extra driver required. Advanced chipset with good thermal design, will not heat even if used for a long time, prevents overcurrent, overvoltage, and short circuits.

Dual-function USB C Ethernet hub transforms a single USB Type-C port into a 3 port USBC hub with Ethernet; Connect a keyboard, mouse, flash drive or other USB 3.0 or USB 2.0 peripheral using this USBC Ethernet Hub; Add Gigabit Ethernet network capability to a computer without an RJ45 network port with this USB C Ethernet adapter

Wireless alternative Ethernet to USB C hub provides an option in locations with Wi-Fi dead zones; Stream large video files with this USB-C hub with Ethernet; Download a software upgrade through a wired home or office LAN with this Ethernet to USBC dock; USBC to Ethernet adapter provides better security than most wireless connections. USB C to USB adapter hub also provides a fast data transfer rate up to 5 Gbps

Dell companion Thunderbolt 3 to Ethernet adapter hub weighs less than 2 Ounces; Ethernet to USB C Dock with USB C Multiport adapter is compatible with popular Dell models with Thunderbolt 3 including the Dell XPS 12 9250, 13 9350/9360/9365, 15 9550/9560, Latitude 5480/5580/7275/7280/7370/7480/7520/7720/E5570, Precision 3520/15 3510/5510/M7510, 17 M7710, Alienware 13/15/17

More ports, more convenience - features an USB-C PD charging port (up to 87W) , 4K HDMI (60Hz) video output, USB-C data port (up to 40 Gbps), 2 USB 3.0 (up to 5 Gbps) and Micro/SD card reader (UHS-I).

Slim and compact - portable design makes it simple to take the Type-C Por Hub wherever you go - easy to use, with no additional drivers or installation necessary.

Modern, aluminum design - brushed aluminum finish perfectly complements your Apple accessories, available in Silver and Space Gray.

【4K@30hz HDMI Support 3D】: The USB C to HDMI adapter can steam Ultra HD 4K 30hz / 2k / 1080p /3D videos to your 4k TV / Projector from laptop/Samsung phone/Nintendo Switch, making your work more convenient or your family enjoy a better visual feast. (★NOTE: For 4K video, it only supports 30Hz refresh rate and DOES NOT support 60hz refresh rate)

【80W USB C PD FAST CHARGE】: The USB C PD port supports up to 80W Power Delivery PD 2.0 (20V/3.25A, 15V/3A, 9V/2A ,5V/2A )fast charging for your laptop when connecting with a PD wall adapter. (★ Fast charging is only for laptops but not for phones: S9/S8/Note8, LG G5/G4 etc. only support normal charging)

【USB C 3.1 TO USB 3.0/2.0】: The USB type-c docking station can extend your laptop/phone to USB 3.0 ports with 5Gpbs transfer speed for external hard drive, USB flash drive, mouse, phone, USB headphone, webcam etc.(NOTE: ★1.Charge phone through USB port will only get 1.5A current with a slow charge)

Type C USB 3.1 Hub & USB 3.0 Hub: includes an extra USB C adapter, can transform USB 3.0 port into USB 3.1 type-c port, allow one device to compatible with variety Apple MacBook Pro, Mac air, iMac, PS4/PS4Pro/PS4 Slim/PS5, surface Pro, Chromebook, Pixelbook, computer, laptops, Xbox, Dell, Samsung, HP, Acer, Lenovo, ASUS and other devices simultaneously. Save users time and equipment costs.

Advanced Chipset with 3.3 ft. extension cable: with 3.3 feet/1 meter of cable, you can arrange your laptop or desktop workstation for maximum comfort and productivity. Both for desktop PC or laptop setups. Advanced Chipset with good thermal design, will not heat even if used for long time.(A computer desk height generally is about 2.5ft/75cm)

4-In-1 data hub with superspeed: every port is equipped with USB 3. 0 technology, capable of transferring data at speeds of up to 5gbps—fast enough to transfer a HD movie in seconds.

【9 In 1 USB-C Hub 】All Expansion From A Single USB-C Port, you will get 2 HDMI output,1 DP output,4K@60HZ resolution and vivid video,1 Type C PD 3.0 charging port provides 100W super-fast charging speed, 1 USB 3.0 ports (5Gbps) and 2 USB 2.0 (480Mbps) ports help you transfer the data and connect with the wireless devices; SD & TF card reader makes you get way more.

【4K@60HZ UHD Visual Feast & Triple Display】This USB-C Docking Station With three high-definition video output ports: HDMI+HDMI+DP, but only the Windows system supports the Triple display, Mac OS is not supported.Under Extended Mode, you can totally enjoy 4 multiple display from 2 HDMI output, one DP output and one screen of laptop. For Collage Mode, our hub support triple display: one of HDMI output, one of HDMI+DP and one of laptop. But only Windows system support MST, Mac does not support.

【Reliable Data Syncing USB Port Design】 Transfer and backup your files at speeds up to 5Gbps via the Type-C port and 1 USB 3.0 ports; 2 USB 2.0 Ports help to a better connection with the wireless mouse and keyboard. Built in SD and TF slots for easy access to files from universal SD and Micro SD Memory Card, support 2 cards reading simultaneously.

[Massive Docking Station] - Before your purchase, please ensure the USB-C port of your laptop supports video output or Display Alt mode, which decides the HDMI ports & DP port work or not. Tiergrade 12 in 1 USB C Hub turns a single USB-C port into 2 HDMI 4K port, 1 Display Port, 2 USB 3.0 ports, 2 USB 2.0 ports, 1 Type C USB 3.0 data port, 1 USB-C 100W charging port, 1000M RJ45 Ethernet Port, and SD & TF 5Gbps card reader.

[Ultra HD 4K Output and Triple Display] - Mirror or extend your screen with the HDMI port and directly stream 4K UHD or full HD 1080P video to HDTV, monitors, or projectors for a cinema-like visual feast. Support both SST and MST mode. Please note that if you use it on Apple Mac OS system, it only supports mirror mode without triple display.

[RJ45 Ethernet and Effortless Data Transfer] - Instant stable access to the Internet with the 1000M Ethernet port, anywhere and in just a flash. USB C Docking Station equipped with 2x USB 3.0 ports (up to 5Gbp/s). 2x USB 2.0 ports allow you to connect the keyboard or mouse without any lags. The SD TF Card reader (Speed up to 104 Mbp/s) for USB-C/Type-C/Thunderbolt 3 devices to access files, quickly view your photos or videos, perfect for photographer or designer or video editor,etc.

USB-C DIGITAL AV MULTIPORT ADAPTER - iMXPW TREVINO USB-C HUB for connecting a Type-C-equipped PC or Mac laptop to an HDMI display, while also connecting a standard USB device and a USB-C charging cable.

HDMI PORT - iMXPW TREVINO USB-C to HDMI adapter supports up to 4K resolution (3840 x 2160 @ 30 Hz) enabling clear audio and video.

TYPE-C PD PORT - iMXPW TREVINO USB C HDMI HUB allows for pass through charging to power a PC/ MBP laptop, supplies power up to 60W (20V/3 A). NO DATA TRANSFER.

3-In-1 & Multifunctional. Helps you to connect laptop with Type C male port to a display monitor/projector/HDTV with HDMI port and other devices (phones, mouse, USB flash disk, keyboard, etc) ,with USB 3.0 port, also charges your laptop with USB Type C female port.

Supports High Resolution. Supports video resolution up to 4K (Full HD) with easy connection of most monitors, projectors, HDTV with HDMI port.

USB PD (Power Delivery) Function. Type C can charge your device which was connected to the Type C male port on this adapter (Such as Huawei Mate 10, 12 inch Macbook, Google new Chromebook Pixel and more). No worrying about power shortage. Type C can not support data transfer, only charge.

10Gbps SUPER SPEED DATA TRANSFER: VANGREE USB C hub data transfer speed up to 10Gb/s (10240MB/s), allowing you transfer a HD movie in a few seconds.(10Gbps speeds require USB 3.1/3.2 Gen 2 type c port). It can synchronize data through 3 USB C data transfer ports while sharing 10Gb/s data bandwidth. Note: The 3 USB C data port only supports data transmission, not for charging, monitor.

4K HDMI SHARP RESOLUTION: VANGREE USB C adapter HDMI port can mirror or extend your screen and streams 4K UHD (3840x2160@30Hz), full HD 1080p or 3D video directly to your HDTV, monitor or projector. You can enjoy a movie with your family on a larger screen or give a vivid presentation in a meeting.

100W FAST POWER DELIVERY: VANGREE USB C multiport adapter can charge your MacBook Pro & Air or other type-c devices while connecting to the 100W Power Delivery port. So you can safely charge your laptop while 3 USB-C data ports working simultaneously. Thunderbolt 3/4 compatible. Support system: Windows/Mac/iPad OS/Linux (Note: USB-C PD charging port is only applicable to USB C port that supports PD protocol).

【USB C to Dual HDMI, VGA Adapter】Plug and play, expand to triple monitor with 3 video ports, also comes with 1000M Ethernet port, type-C PD charging port, 3.5mm audio mic jack, SD/TF card reader, two USB 3.0, two USB 2.0.

【Support 100W Power Supply】Support maximum 89W power to charge your Dell HP Macbook Lenovo Surfac and other type-c laptop. NOTE: package does not include the 100W power adapter.

【3 Monitors Expansion】Under DP1.4 sources, single HDMI (HDMI 1) using can reach 4K@60Hz. 2×HDMI working can reach 4K@30Hz + 2K@60Hz. Dual or triple display with VGA, resolution will be 1080P@60Hz. Please note Mac OS does not support MST.

【Extend 4 USB 3.0 Ports】Aceele Type-C hub turns one USB-C port on your laptop into 4 USB 3.0 Ports, easily connecting with keyboard, mouse, USB flash disk, and other USB devices to your USB-C phone or table. Note: This USB Hub is not designed to charge devices.

【High Speed Transfer】Transfer HD movies or large files in just seconds with super fast data transfers of speed up to 5Gbps, 10X faster than USB 2.0/480 Mbps.

【Unique Upgrade】We have added a unique USB-C Power port to the hub. When you connect mobile hard drive(HDD) or other devices with high power consumption, using the USB-C power supply port can help you to run these devices smoothly and protect your work efficiency. Note: USB C Port cannot charge host devices or transfer data.

The USB Hub tansfer a single USB port into 4 USB data ports. you can get 1 USB 3.0 and 3 USB2.0 ports with your laptop. No software, drivers or complicated installation process requirement.

USB Hub Multiport Adapter contains 1*USB 3.0 and 3*USB 2.0. The USB 3.0 supports super faster data transfer up to 5Gbps which is 10X faster than USB 2.0 (480 Mbps), which allows you to transfer datas in just seconds; USB extension hub was built in OTG function chip, it can easily connect the mouse, keyboard, USB disk, and other USB devices.

This usb a splitter has a wide range of compatibility, including USB cables, flash drives, mice, keyboards. Also works with hubs for MacBook Pro 2021/2020/2019, Google Chromebook Pixelbook, Samsung series and laptops and more USB devices. Note: This hub support output max current up to 900mA, so some HDDs that need a current of more than 900mA need an external power adapter.