Sna-360 analogue addressable photoelectric smoke detectors are microprocessor controlled state-of-the-art detectors Compatible with popular control and indicating equipment loop protocols. Advanced electronics in conjunction with a photoelectric smoke sensing chamber provides early detection of fire and High immunity against unwanted alarms. Photoelectric smoke sensor Analogue detection discrimination Dual leds for 360° visibility Dc 24 v operation 2-wire connection to many popular loop protocols Dip switch address setting 125 usable detector address settings per loop Optional remote led output