10 Best Smoke And Co Alarm 2026 in the United States

The Kidde Smoke & Carbon Monoxide Detector offers reliable 2-in-1 protection by combining photoelectric and electrochemical sensors, which detect both smoke and harmful carbon monoxide. Its standout feature is the built-in 10-year lithium battery, which means you won't have to worry about battery replacements or annoying low-battery chirps for a full decade. This long lifespan can save you money and hassle over time.

The alarm uses LED lights to clearly show if everything’s okay, if there’s an error, or if smoke or CO is detected, and it sounds a loud 85-decibel alarm to alert you promptly. Installation is simple—no wiring needed—just mount the bracket and twist the alarm into place. A test and hush button lets you easily check the device works and temporarily silence false alarms, which are less frequent thanks to enhanced sensing technology that reduces false triggers from cooking. The device meets up-to-date safety standards (UL 217 and UL 2034), ensuring it follows rigorous testing.

This model does not support interconnectivity, meaning each alarm works independently rather than linking with others in your home, which may be a drawback if you want your alarms to sound simultaneously. It also lacks smart features like smartphone alerts or voice integration. If you want a straightforward, low-maintenance smoke and CO alarm with a very long battery life, this Kidde model is a solid choice. Just remember to manually test it weekly and replace it after 10 years as recommended.

The First Alert SMCO100 is a reliable battery-operated combination smoke and carbon monoxide alarm designed for easy installation since it doesn’t require wiring. It uses photoelectric sensors, which are known to reduce false alarms from cooking smoke, making it suitable for kitchens or nearby rooms. This 3-pack offers good value for protecting multiple areas.

While it doesn’t support interconnectivity with other alarms or smart home devices, it includes a test/silence button for quick checks and to temporarily quiet false alarms. The included alkaline batteries make it ready to use right away, but you will need to replace batteries periodically. The alarm also has an end-of-life warning to remind you when it’s time for a replacement, which helps maintain long-term safety.

It meets industry standards for smoke and CO detection, ensuring dependable protection. This model does not offer smart features such as linking alarms together or connecting to a phone app for remote alerts. It is a solid choice for anyone seeking straightforward, dependable smoke and carbon monoxide detection without the extra complexity of smart technology.

The First Alert SMCO100 is a battery-operated smoke and carbon monoxide alarm that uses photoelectric sensing technology, which is effective at detecting smoke from smoldering fires while reducing false alarms often caused by cooking. This feature is particularly useful in kitchens or busy homes where nuisance alarms are common. It provides reliable 2-in-1 protection by combining smoke and CO detection in one device, making it practical for general home safety.

Powered by included AA batteries, the alarm is easy to install without wiring, and the batteries are user-replaceable, simplifying maintenance. It includes a test/silence button to quickly check if it’s working or temporarily stop false alarms. Additionally, it offers an end-of-life warning to inform users when it’s time to replace the unit, enhancing safety over its lifespan. However, this model lacks interconnectivity, so multiple alarms in a home won’t communicate or sound simultaneously, which could be a limitation for larger houses. It also does not have smart features like app alerts or voice notifications, so remote monitoring isn’t possible.

The product meets industry standards for safety and comes with a 10-year limited warranty, providing confidence in its long-term performance. This alarm is ideal for users seeking straightforward, reliable smoke and CO detection without the need for extra smart capabilities or complex installation.