Main Features:
ASIC control;  Auto-reset after alarm
LED indicator and Test button; Low battery indication
Dustproof,mothproof and anti-white light design
Wire interconnect 40pcs HEIMAN smoke detector

Technical Specification:
Power supply: DC9V battery; Infrared photoelectric sensor
Sound & flash alarm; Sould volume:  ≥85dB/3 meters
Sensitivity: 2.06%/ft;  Detecting area: 20㎡
Dimension: Φ128*38mm