Wall Mounted Addressable Fire Hydrant Button , Fire Alarm Push Button Device

LD2004EH Addressable Fire Hydrant Button Embedded MCU; Addressable, electronic coding, occupies one address in the system(code# from 0~255); Used in 2 Bus fire alarm system, none polarity; Can be started repeatedly; Alarm Reset with a special key; A spare set of passive normally open output contacts (DC 30V/0.1A) are provided; Good quality of Moisture proof, Fireproof and Anti-interference; Need to match with Base LD20-EN; Surface mounting. Technical Data LED indicator: Red