10 Best Carbon Monoxide Detectors 2025 in the United States

The X-Sense Combination Smoke and Carbon Monoxide Detector offers solid dual-sensor protection using electrochemical and photoelectric sensors, which reliably detect both smoke and carbon monoxide. This 3-unit set comes with a base station that connects to a 2.4 GHz Wi-Fi network and integrates with the X-Sense Home Security App, allowing you to receive instant alerts on your phone and share alarm warnings with up to 12 family members, adding a helpful layer of remote monitoring. The talking alarm feature clearly announces the type and location of danger, making it easier to act quickly, especially in larger homes.

The detectors are battery-powered with replaceable CR123A batteries that last up to 5 years, supported by sensors rated for a 10-year lifespan, so frequent battery changes aren’t needed. Installation is straightforward, aided by voice prompts guiding setup, tests, and maintenance. The slim, modern design blends well with home decor and fits over old mounting holes for easy replacement.

One limitation is the app connection only supports 2.4 GHz Wi-Fi, so homes with exclusively 5 GHz networks might face setup issues. Also, the professional monitoring service that can dispatch emergency responders within 3 seconds requires a paid subscription, which might not suit all users. While the product is priced above basic alarms, its combination of clear voice alerts, app integration, and long sensor life makes it a strong choice for users wanting smart, reliable safety with minimal hassle.

The FIRST ALERT BRK SC9120FF combines smoke and carbon monoxide detection, making it a versatile choice for home safety. Its hardwired design, paired with a battery backup, ensures continuous operation even during power outages. This model features dual sensors: electrochemical for detecting carbon monoxide, and ionization for smoke, providing reliable detection.

One of its standout features is the ability to connect with other compatible detectors, which is particularly useful for larger homes or multiple-unit installations. The 85-decibel audible alarm is loud enough to serve as an effective alert in emergencies. Installation is straightforward, thanks to its universal mounting brackets, and the design includes tamper-resistant features to keep it securely in place.

Its user-friendly aspect is emphasized by a single button for testing and silencing alarms. However, being hardwired, it requires installation in a location where electrical connections are accessible, possibly limiting placement flexibility compared to entirely battery-operated models. Additionally, while the product is highly rated and trusted, the reliance on a side-load battery compartment might be less convenient for some users compared to front-load options. Despite these considerations, the integration of smoke and carbon monoxide detection, combined with a solid reputation and trusted performance, makes it an appealing choice for comprehensive home protection.

The X-Sense Smart Smoke and Carbon Monoxide Detector Combo is designed for those seeking a battery-operated, interconnected alarm system. Its photoelectric sensor provides reliable detection for both smoke and carbon monoxide, which is crucial for early warning and safety. The product comes with a set of five detectors and a base station, enhancing coverage across multiple rooms. One of its standout features is the wireless interconnectivity, ensuring that if one alarm is triggered, all alarms sound simultaneously, which can be particularly beneficial for larger homes or buildings.

Its power source is a replaceable lithium battery, offering the convenience of wireless installation. This is great for homeowners who prefer not to deal with hardwiring, although it does mean keeping an eye on battery life, which the device helpfully alerts you about through its app. The app also offers practical features like remote test and silence, notifications for low battery, faults, and allows multiple users (up to 12) to control and receive updates, adding to its user-friendliness.

However, the requirement of a subscription for premium monitoring services might not appeal to everyone, especially those looking to avoid additional monthly costs. Installation appears straightforward, but the absence of AC power backup could be a downside for those who want an extra layer of reliability. Additionally, while its interconnected feature is useful, it relies on being within range of the base station, which could be a limitation in very large spaces.

In terms of build, the detectors are made from heat-resistant PC material, enhancing their durability. The inclusion of all necessary installation components simplifies the setup process. For those prioritizing ease of use and the ability to manage alarms via a smartphone, this product offers a modern solution, though it may not be the best fit for users who prefer a hardwired option or those who find subscription services cumbersome.