10 Best Carbon Monoxide Detectors 2025 in the United States

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.

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.

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.