10 Best Interconnected Smoke Alarms 2025 in the United States

The X-Sense Wireless Interconnected Combination Smoke and Carbon Monoxide Detector is a solid choice for those seeking comprehensive safety solutions in their homes. One of its standout features is the interconnected system; when one unit detects smoke or carbon monoxide (CO), all alarms in the network sound off, ensuring that you receive timely warnings no matter where you are in the house. This is particularly beneficial for larger homes, as you can connect up to 24 devices, creating a wide coverage area. Each unit is equipped with both a photoelectric smoke sensor and an electrochemical CO sensor, providing reliable detection for both hazards.

Another advantage is the built-in 10-year lithium battery, which means you won't have to worry about changing batteries regularly. The informative LCD display shows real-time CO levels and battery status, adding a layer of convenience and transparency.

The X-Sense detector is a reliable and user-friendly option for those prioritizing safety in their homes. It offers important features and solid performance.

The Kidde Hardwired Smoke & Carbon Monoxide Detector offers a 2-in-1 solution, detecting both smoke and carbon monoxide, which is cost-effective and space-saving. Its hardwired power source ensures reliable operation, with the added security of a 2 AA battery backup for power outages. The use of photoelectric and electrochemical sensors improves accuracy, reducing false alarms typically caused by cooking or steam. This model also features voice alerts, clearly distinguishing between fire and carbon monoxide warnings, which can help users act quickly in emergencies.

Interconnectivity is a significant benefit, ensuring that if one alarm goes off, all connected units will sound, providing comprehensive home coverage. The inclusion of LED indicators for normal operation, errors, and alerts adds an extra layer of user-friendly monitoring. Installation is straightforward with the provided mounting hardware, although being hardwired means it may require some electrical know-how or professional installation. However, the maintenance is relatively low, needing only a weekly button test to confirm its operation.

On the downside, it lacks advanced smart features like app connectivity, which some modern interconnected alarms offer. The alarm volume of 85 decibels is loud enough to be effective but might not be the loudest available. This product is best suited for users looking for a reliable, dual-function smoke and CO detector with basic interconnectivity and straightforward maintenance.

The First Alert SMI100-AC smoke alarm system is a solid choice for those looking to enhance fire safety in their home. With its interconnected design, when one alarm is triggered, all compatible alarms will sound, offering an added layer of security. This is especially beneficial in larger homes where a smoke alarm in one area may not easily alert individuals in other rooms. The advanced sensing technology helps reduce false alarms caused by cooking, which is a common annoyance with traditional smoke detectors.

One of the standout features is the battery backup, ensuring that these alarms continue to function even during power outages, providing peace of mind when you need it most. The quick connect plug facilitates easy installation, which is great for those who may not be comfortable with complex wiring. Plus, the visual alarm indicator helps you identify which unit initiated the alert, making it easier to respond quickly.

However, there are a few drawbacks to consider. The system uses ionization sensors, which are effective for detecting flaming fires but may not be as responsive to smoldering fires compared to photoelectric sensors. Additionally, since these alarms are battery-powered, you'll need to remember to replace the batteries periodically to maintain their functionality. Even though batteries are included, it's an important maintenance task that can be overlooked. While it does provide a loud alarm, some users may prefer a system that offers adjustable sound levels. The product is also relatively new on the market, so long-term reliability is still to be fully established. Ultimately, the First Alert SMI100-AC is well-suited for homeowners looking for an efficient, interconnected smoke alarm solution that balances advanced features with ease of use.