First Alert 1039765/P1010 Micro Smoke Alarm, White, 3 VHighlights: Alarm Type: Audible Color: White Dimensions: 1 1 2 in L x 1 1 2 in W x 1 1 2 in H Housing Material: Resin Plastic Operating Temperature: 40 to 100 deg F Power Source: Battery Power Supply: 3 V Sensor Type: Photoelectric Sound Level: 85 dB Much smaller than a traditional smoke detector, the First Alert P1010 micro smoke alarm features a modern, ultra compact design that can be unobtrusively mounted on a wall or ceiling The unit is