• Visible status indicator • Optical smoke and thermal heat detection • Report alarm, tamper and low battery • Built-in siren 85dB • Diameter: 125 mm • Height: 63 mm • Weight (including battery): 243 g • Color: White • Operating Temperature: 4.4 ºC - 37.8 ºC • Operating Temperature with Heat Detector: 0 ºC - 37.8 ºC • Operating Temperature for Smoke Alarm: 5 ºC - 45 ºC • Heat Alarm: 57 ºC • Approved Batteries: 3 AAA