10 Best Carbon Monoxide Detectors 2026 in the United States

The First Alert BRK SC9120B-3 is a reliable choice for anyone looking to protect their home from both smoke and carbon monoxide hazards. It uses two types of sensors: an electrochemical sensor for detecting carbon monoxide, and an ionization sensor that reacts quickly to fast-burning fires. This dual-sensor approach enhances safety by covering different types of fire and gas risks.

One of the standout features is its hardwired design combined with a battery backup. This means the alarms will keep working even during a power outage, giving you peace of mind around the clock. The unit’s alert system includes an 85-decibel siren—loud enough to wake most people—and indicator lights that clearly show what kind of danger is detected.

Installation is straightforward thanks to universal mounting brackets and a tamper-resistant design, making it suitable for use in various locations around the home. The detector can also be interconnected with other compatible First Alert alarms, so if one unit senses danger, all alarms will sound, improving safety. The display is simple, with indicator lights and a single test/silence button that makes it easy to check the system or temporarily quiet a false alarm. It also comes with a dust cover to help keep the sensor clean. This 3-pack is ideal for homeowners who want dependable, long-term monitoring of both smoke and carbon monoxide with backup power, especially in larger homes or multiple rooms. Note that installation requires wiring, which might need professional help if you’re not comfortable with electrical work.

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector (SC06-W) is a comprehensive safety solution that offers dual protection against smoke and carbon monoxide. It uses two types of sensors – photoelectric for smoke and electrochemical for CO – ensuring reliable detection of both hazards. A notable feature is its wireless interconnection capability, which means that when one alarm goes off, all interconnected alarms in the home will also sound, providing full home coverage.

You can link up to 24 units for extensive protection, which is impressive for larger homes or multi-story buildings. The detector is powered by a 10-year sealed lithium battery, reducing the need for frequent battery changes and offering long-term peace of mind. However, it doesn't have Wi-Fi, so it lacks features like remote alerts that some other modern detectors offer. The inclusion of a test/silence button allows for easy maintenance and management of false alarms.

Installation is straightforward, and the necessary screws and plugs are included. This makes it a solid choice for anyone looking for effective, long-lasting protection without the need for complex setups or continuous maintenance.

The X-Sense Smoke Detector Carbon Monoxide Detector Combo is a reliable device that offers dual protection against smoke and carbon monoxide. A standout feature is its 10-year sealed battery, meaning you won’t need to worry about changing batteries for a decade. Installation is straightforward as it requires no rewiring, making it user-friendly.

The alarm is loud at 85 dB, ensuring it grabs attention quickly in case of danger, and the upgraded sensors are designed to minimize false alarms while responding swiftly to real threats. The material is durable, heat-resistant, and corrosion-resistant, enhancing the device's longevity and reliability.

However, this unit does not support wireless interconnection or Wi-Fi, which means it operates independently without syncing with other alarms or smart home systems. This might be a drawback for users looking for interconnected safety systems. Additionally, it is a standalone model and cannot be used with a base station. This 3-pack is ideal for households looking to cover multiple rooms with essential smoke and carbon monoxide protection.