First Alert BRK 7010 Hardwire Smoke Alarm with Photoelectric Sensor 120-volt hardwire smoke alarm with photoelectric sensor Features convenient silence/test button, dust cover, 85-decibel alarm Inter-connectable with BRK and First Alert hardwired smoke and carbon monoxide alarms Intuitive latching alarm indicator identifies which unit triggered alarm Backed by 10-year limited warranty and tested to meet UL 217 standards