10 Best Interconnected Smoke Alarms 2025 in the United States

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 SMCO500V is a battery-operated smoke and carbon monoxide alarm designed to provide reliable 2-in-1 protection for your home. Its photoelectric sensor is good at detecting smoke while reducing false alarms from cooking, which can be a common nuisance. One of its main strengths is the interconnectivity feature: when one alarm sounds, all compatible alarms will also alert you, increasing safety by making sure you hear the alarm throughout your home.

This model also offers clear voice and location alerts, so you know exactly what the danger is and where it’s coming from, which is very helpful during an emergency. Being battery-powered makes installation straightforward since you don’t need wiring, and it comes with batteries included, simplifying setup. Maintenance should be easy, as it uses standard AA batteries and includes a long 10-year limited warranty, giving peace of mind about its durability.

On the downside, since it relies on batteries, you’ll need to replace them periodically to keep it working, unlike hardwired models that connect directly to your home’s power. There are no advanced smart home integrations, so it won’t connect to apps or smartphones for remote alerts. This alarm is a strong option for anyone looking for a reliable, easy-to-install smoke and CO detector with interconnectivity and voice alerts, without the complexity of smart home features.

The Kidde Hardwired Smoke Detector is a reliable choice for those looking for interconnected smoke alarms. It features a hardwired installation with a 10-year battery backup, which means it remains operational even during power outages and reduces the hassle of frequent battery changes. The interconnect capability ensures that when one alarm triggers, all others will sound, providing comprehensive home protection. The photoelectric sensor is designed to minimize false alarms usually caused by cooking, which is a common concern in many households.

Installation might be a bit involved since it requires 120V AC wiring, making it more suitable for permanent residences rather than temporary setups. However, once installed, the 10-year warranty and the maintenance-free battery life can offer peace of mind. The alarm at 85 decibels is quite loud, ensuring you'll be alerted in case of an emergency.

Smart features include LED indicators for different statuses: green for regular operation, amber for errors, and red for smoke detection. The self-testing function is a nice touch, although users are still encouraged to perform manual tests regularly. Additionally, the Test & Hush button helps in testing the device and silencing false alarms. Kidde's smoke detector is well-suited for individuals looking for a durable and efficient smoke detection system with minimal maintenance. While it might not have advanced smart-home integration features, its focus on safety and reliability makes it a solid investment for home security.