10 Best Interconnected Smoke Alarms 2025 in the United States

The Kidde Hardwired Smoke & Carbon Monoxide Detector 3-pack is a solid choice for those looking to protect their home with interconnected alarms. It combines smoke and carbon monoxide detection into one device, which can save money and space. The alarms are hardwired with a backup of 2 AA batteries, so they stay functional even during power outages. It uses photoelectric and electrochemical sensors, providing reliable detection and reducing false alarms caused by cooking. The alarm volume at 85 decibels is loud enough to alert you effectively.

These units interconnect, meaning if one alarm detects danger, all alarms in the home will sound, enhancing safety. Installation is fairly straightforward if you have existing wiring; however, it might be a bit challenging for beginners without electrical experience. The test/hush button allows easy maintenance, and the 10-year limited warranty offers peace of mind.

Although it doesn’t include advanced smart features like mobile alerts, its dependable performance and compliance with the latest safety standards make it a practical option for families wanting a trustworthy, interlinked smoke and CO alarm system.

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 First Alert SMI100-AC is a hardwired interconnected smoke alarm that comes with a battery backup, ensuring protection even during power outages. Its Precision Detection technology helps reduce false alarms from cooking while still providing early and reliable fire warnings. When one alarm is triggered, all compatible units sound together, which is a crucial safety feature for larger homes. Installation is made easier with a Quick Connect Plug, so you don’t need to handle complex rewiring. The alarm also visually indicates which unit triggered, helping you quickly locate the issue.

Powered directly by your home’s electrical system with a 9V battery backup, it offers continuous protection but does require proper installation of the wiring. The alarms produce a loud audible sound, suitable for waking up residents during emergencies. While it lacks advanced smart features like phone alerts or app integration, it covers the core safety functions well.

Maintenance is fairly straightforward, mainly involving occasional battery changes and periodic testing. The 6-pack is ideal for larger homes or those wanting multiple coverage points right away, offering good value and consistent performance. However, if you are looking for Wi-Fi connectivity or integration with smart home ecosystems, this model does not provide those options. This product represents a reliable and user-friendly choice for anyone needing dependable interconnected smoke alarms with easy installation and strong detection capabilities, especially if you prefer a hardwired solution with battery backup.