Best X Sense Carbon Monoxide Alarms in 2026

Product 1: To ensure complete protection make sure to place one on each level of your home and in each bedroom

Product 2: High-quality & cost-effective smoke detector - advanced detection from a trusted leader in fire safety for over 100 years

Product 2: No battery fuss - Sealed-in lithium battery never needs replacing over the ten-year life of the smoke alarm

Product 2: Easy installation - smoke detector will automatically activate when attached to the mounting bracket

Product 2: Test-silence button - allows for testing & silencing false alarms from routine cooking and shower steam

Photoelectric sensor detects visible fire particles associated with slow, smoldering fires, while the electrochemical sensor detects carbon monoxide

85-decibel alarm & LED warning indicators alert you to various status: green = normal operation, amber = operating error, and red = smoke, fire or carbon monoxide event

Battery operated to provide reliable detection, even during power outages; two AA batteries included

UL Certified with a 10-year limited warranty on alarm

Product 1: Easy to read digital display - allows for easy viewing of carbon monoxide levels

Product 2: Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire

Product 2: Protects during a power failure - smoke alarm operates on one, 9-volt battery in the back of the unit

Product 2: Whole home family protection - place 1 fire detector on each level of your home & in your bedroom

Product 2: Test-Hush Feature - silences the unit for approximately 7 minutes

Test-Hush Feature - silences the unit for approximately 8 minutes; tamper-resistant technology deters removal of the unit from the wall or ceiling

UL Certified, 10-year limited warranty

Loud pulsing alarm that will sound to alert you to a potential problem

Low battery warning feature indicates when the battery needs replacement

UL Certified, 5-year Limited Warranty

Two alarms in one detects carbon monoxide and explosive gas

Three convenient mounting options

Digital display and peak level button displays the peak CO level recorded by the alarm since it was last reset

Battery backup 9 volt battery included

Kidde’s carbon monoxide alarms meet the requirements of Underwriters Laboratories (UL), an independent facility that tests products for compliance with widely-accepted safety standards

Product 1: Whole home family protection - place 1 carbon monoxide detector on each level of your home & in your bedroom to protect from poisonous gases

Product 2: Ionization sensing technology - hardwired smoke detector detects invisible fire particles, 85 decibel alarm alerts of fire

Product 2: Protects during a power failure - smoke alarm operates on one, 9-volt battery in the back of the unit

Product 2: Whole home family protection - place 1 fire detector on each level of your home & in your bedroom

Product 2: Test-Hush Feature - silences the unit for approximately 7 minutes

Low battery warning - One chirp followed by warning “low battery”. The red LED light will flash. This pattern will continue every minute for the first hour. After the first hour the red LED light will flash once every minute accompanied by the chirp sound. The “low battery” warning will only sound once every fifteen minutes. Voice Hush Indication: “Hush activated” and “Hush cancelled” voice announcement

Alarm memory - The green LED will blink once every 16 seconds to alert a user when the unit has alarmed for smoke or has detected a concentration of CO. If the alarm has detected a CO level of 100ppm or greater, when the test/reset button is pressed the unit will announce “CO previously detected”. If the alarm has detected abnormal levels of smoke since its last test, it will produce three rapid beeps.

AC-Wire with battery backup, An included 9V battery protects during short-term power outages

Front-loading battery with unique battery door design

Voice warning with green and red LEDs

Photoelectric smoke sensor – May detect visible fire particles associated with slow smoldering fires sooner than an ionization sensor.

Tamper resistant

Test-Hush Feature - silences the unit for approximately 9 minutes

UL Certified, 10-year limited warranty

9-volt battery backup provides protection during power outages

Meets Underwriters Laboratories (UL) requirements for safety standards

The digital display feature allows for easy viewing of carbon monoxide levels from 30-999PPM (parts per million)

Enables extension of coverage & protection without any need for additional wiring

Ambient Light Sensing feature establishes a day/night cycle and prevents late-night battery chirps in dark conditions

LED warning light indicators alert you to various statuses: a green light indicates the unit is in proper working operation, an amber light indicates an operating error, and a red light indicate smoke or fire

Interconnection capability: allows you to connect up to 24 Kidde smoke, heat, or CO alarms, with the possibly it interconnect 6 strobe lights or relay modules

UL Certified, 10-year limited manufacturer warranty

Compatible with RemoteLync Bridge - Connect to the Kidde app for additional features and benefits

Compatible with Amazon Alexa, Google Home, iPhone, & Android smart devices

Indoor Air Quality Monitoring: monitors harmful chemicals known as Total Volatile Organic Compounds (TVOCs) that come from cleaning products & paint, also monitors humidity & mold risk

WiFi enabled technology allows notifications to be sent to your smartphone (as well as friends & family) in the event of a CO hazard in your home

Electrochemical sensor technology detects poisonous carbon monoxide gas inside your home

First UL listed carbon monoxide & indoor air quality monitoring device; 10-year limited manufacturer warranty on alarm - not a battery replacement claim

Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, 2 were needed. Reduces installation time and helps to keep home décor attractive.