BRK, 120V, 10 Year, White, ACDC, Smoke Alarm, Hardwired, Battery Back Up, Locked 9V Battery, Gasket Less Mount, Ionization Smoke Sensor Reliably Detects Particles From Fast Flaming Fires, Can Integrate With Up To 12 Other First Alert Or BRK Hardwired Smoke Detectors, Not Included, Reset Button, Detects Smoke Carbon Monoxide, UL Listed, NOTE Please Check Your Local Building Code Requirements Before Installing This Product To Determine Compliance With Applicable Standards