Don't let your family or home be endangered by fire! Protect them from catastrophic fires with an ultra-reliable smoke detector that connects to your security system and even supplies its own built-in power supervision relay. Standard hardwired smoke detectors for security systems are good, but usually require a separate power supervision relay to ensure proper operation. But this powerful unit has the relay built in. Combine that with its self-diagnosing feature that continually monitors its own sensitivity and operational status, and you'll have a failsafe fire warning system with a reliability level that simply can't be matched. This life-safety device is designed to be hardwired via 4-conductor cable to a monitored or standalone security system. When it detects smoke, it triggers a loud 85dB audible siren and sends an alarm condition to the control panel. If the security system is monitored by a third-party monitoring company, security personnel can summon the local fire department to respond. It's the perfect way to protect your house whether you're away from home or sleeping soundly. This unit should be connected to a home security system as the last smoke detector of a multi-detector zone. This is important because if power is lost to one of the smoke detectors on the zone, and no power supervision relay is installed, the security control panel will still "see" the end-of-the-line resistor and would not indicate trouble. But this smoke detector eliminates that problem, ensuring that you'll be alerted to maintenance requirements before it's too late.