The Best Smoke & Carbon Monoxide Detectors 2025

1. SimpliSafe - Smoke & Carbon Monoxide Detector - White

Get alerted the minute a dangerous hazard threatens your home with the 2-in-1 smoke and carbon monoxide detector. Engineered to tell the difference between dangerous smoke and burning food, so you’ll always know when there’s a real emergency. It’s also backed by SimpliSafe’s award-winning security system and 24/7 professional monitoring—any time there’s trouble, emergency assistance will be quickly sent to your front door.* Setup is easy too with the included hardware. Plus, thoughtful notifications will give you daily updates on your detectors’ status, so you know it’s working properly. *Emergency dispatch is available with select monitoring plans.

2. First Alert - Smoke and Carbon Monoxide Alarm - Works with Ring - White

Connects to compatible devices via 3G, 4G, 4G LTE or Bluetooth; Split-Spectrum, ionization and photoelectric sensors; Nest app (download required); mounting hardware included

First Alert ZCOMBO is a state-of-the-art wireless combination smoke and CO alarm designed to provide early warning of a fire or CO. It features a fully insect screened Photoelectric smoke sensing chamber and an electrochemical carbon monoxide sensor, an 85dB horn, a supervised 3V (2 AA batteries) power supply, utilizes one test button to setup, test and silence. This combination alarm will operate with 3rd party, certified Z-Wave devices enabled with the First Alert protocol and the basic command class required by all Z-Wave devices. First Alert ZCOMBO also includes the Smart Start feature which allows a faster and more intuitive connection of device to hub and on-boarding via use of QR code scan located on device. By the requirements of the Device Class spec, this command class does not have to be mapped to any particular functionality for this device. The alarm supports one association group with up to 1 node and sends its alarms to that group. The alarm supports configuration parameter #1, which has a size of 1, a default value of 0, and when set to 1 causes the device to send double alarm messages. Upon the detection of smoke or CO conditions, the alarm reports smoke and or CO detected to the controller. The device shall send the applicable message when the conditions are cleared. These notifications must be wrapped in the Supervision CC. The following notifications must be supported. The alarm sends a “Heartbeat” signal to hub periodically to confirm operability. It also features tamper resistant locking pins that lock alarm to the mounting bracket and battery drawer to prevent removal of battery or alarm. Designed for wall or ceiling mounting. Includes mounting anchors and screws.

3. First Alert - Smoke and Carbon Monoxide Detector Battery Powered - White

First Alert Battery Smart Smoke Alarm

4. First Alert - Smoke and Carbon Monoxide Detector Hardwired - White

First Alert Hardwired Smart Smoke Alarm

5. uHoo - Smart Indoor Air Quality Monitor - White

Temperature, humidity, PM2.5, carbon dioxide, VOC, carbon monoxide, nitrogen dioxide, ozone, air pressure sensors; works with Nest, Roomba, Amazon Alexa, Google Assistant; uHoo mobile app

Detect allergens and toxins in the air with this uHoo smart indoor air monitor. The uHoo mobile app lets you view nine air quality sensors remotely, providing personalized tips on cleaning the air around your home. This uHoo smart indoor air monitor also features advanced integration capabilities with Amazon Alexa, Google Home, or IFTTT for smooth pairing with air purifiers, dehumidifiers, lights, etc.

6. Eve - Room Indoor Air Quality Monitor - Silver

Keep your home's indoor air quality clean and healthy with Eve Room. The award winning indoor air sensor with Apple HomeKit technology measures air quality (VOC), temperature, and humidity levels in your home. Detect harmful VOC levels caused by everyday items, and track when indoor air quality drops. You can then ventilate in good time, and adopt healthy habits by following the history in the Eve app. Eve Room joins your Thread network automatically and is Apple HomeKit enabled for outstanding ease of use with iPhone, iPad, and Apple Watch. Enjoy the freedom to place the wireless indoor air sensor wherever you like - you can recharge the accessory via USB, and control Eve Room directly without any need for a bridge. And the best thing about all Eve accessories is how they protect your privacy: Eve does not harvest your personal data and there is no Eve cloud, so your data won't get exposed.

7. First Alert - Z-Wave Smoke and Carbon Monoxide Detector - White

Z-wave Smoke and Carbon Monoxide Alarm

8. SimpliSafe - Smoke & Carbon Monoxide Alarm Listener - White

Pair the Smoke & CO Alarm Listener with your current detectors to enable SimpliSafe 24/7 professional monitoring for fire and carbon monoxide. The Alarm Listener works with your existing detectors* to trigger your SimpliSafe System when there’s danger. If an alarm is detected, you’ll get fast phone alerts, so you’ll know something is wrong within seconds. Plus, with a professional monitoring plan, our agents can request immediate emergency dispatch—even when you can’t be reached. The Alarm Listener is finely tuned to hear only the standardized tone patterns of smoke and CO detectors, so you’ll get fewer false alarms from loud noises and televisions. *Works with UL certified Smoke and CO detectors. Professional monitoring plan required for emergency dispatch.