This is a photoelectric detector which detects smoke by a couple of infrared diodes.It is a 9V battery back -up for at least 1 year.
Protection area: 6m high, 60m2
Test Button: Electronically simulates smoke condition, causing the unit to alarm.
Indicator Leds: Intermittent Red Led
DC Power: Audio alarm and rapidly
Local Alarm: Flashing Red Led
Net weight: 185g