BRK Electronics First Alert 3120B 120V AC/DC Dual Sensor Hardwired with two 1.5V AA Battery Backup Photoelectric and Ionization Smoke Alarm

Hardwired Photo/Ion smoke alarm provides double protection for both flaming and smoldering fires. Utilizes both ionization and photoelectric smoke sensors for maximum protection Two Latching Features - Alarm Latch and Low Battery Latch Two Silence Features - Alarm Silence and Low Battery Silence Two AA Battery Backup Optipath 360 Technology 10-Years Limited Warranty Model # 3120B Weight 9.5 oz Dimension 5.0" dia x 2.0"H Operating Voltage 120V AC 60Hz w/ two 1.5V AA battery backup Operating Current 0.07 amps (standby/alarm) Temperature Range 40°F (4°C) to 100°F (38°C) Humidity Range 10% to 90% relative humidity (RH) Audio Alarm 85dB at 10 feet Test/Silence Electronically simulates smoke condition, causing the unit to alarm Press and hold test/silence button Alarm Reset Automatic when smoke clears Interconnections Up to 18 units of First Alert