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 First Alert SMICO100-AC is a 3-pack of smoke and carbon monoxide alarms designed to offer reliable, interconnected home safety. One of its strong points is the interconnectivity feature: when one alarm detects danger, all the alarms sound, providing a quick alert throughout your home. It uses ionization sensors, which are good at detecting fast-flaming fires, and the Precision Detection technology helps reduce false alarms from cooking, which many users will appreciate.

Powered by corded electric with a battery backup, these alarms stay active even during power outages, adding peace of mind. Installation is made simpler with the Quick Connect Plug, so you don't need to do complex rewiring, making it a good choice for users who want straightforward setup. The test/silence button also helps with easy maintenance by letting you check the alarm’s function or silence it without hassle.

A limitation is that ionization sensors are less sensitive to slow-smoldering fires compared to photoelectric sensors, so it might miss certain types of smoke. The alarms don’t include advanced smart features like smartphone alerts or voice control, which some newer models offer. They also require regular battery replacement for the backup function, so some upkeep is necessary. This pack suits homeowners looking for dependable, easy-to-install alarms with solid interconnectivity and dual smoke and CO detection, without needing extra smart capabilities.

The Kidde Hardwired Smoke & Carbon Monoxide Detector is a strong choice if you want reliable dual protection from both smoke and carbon monoxide in one device. It uses photoelectric and electrochemical sensors, which are good at detecting different hazards accurately. Being hardwired with a 10-year battery backup means you won’t have to replace batteries often and the alarm stays powered even during outages. The unit supports interconnectivity so if one alarm goes off, others linked in your home will sound too — an important feature for safety.

The alarm is loud at 85 decibels and provides clear voice alerts that say "Fire!" or "Warning! Carbon Monoxide!" which can help you react quickly in an emergency. The three LED lights give easy-to-understand status updates. Installation requires wiring into your home’s electrical system, so someone comfortable with basic electrical work or a professional installer is recommended. The alarm has a self-test feature but still needs weekly manual tests to ensure it’s working properly.

While it doesn’t include advanced smart features like smartphone alerts, it covers all the essential functions well and comes with a 10-year warranty. This detector pack is ideal for homeowners looking for dependable, straightforward interconnected smoke and carbon monoxide alarms with low maintenance.