Specifications:
Power Source: 120VAC; 9V battery backup
Audio Alarm: 85dB at 10 ft.
Humidity Range: up to 85% relative humidity
Sensor: Ionization
Wiring: Quick connect plug with 8" pigtails
Size: 5.75" in diameter x 1.25" depth
Weight:/b> .5lb
Interconnects: Up to 24 devices (of which 18 can be initiating)