Numens Smoke Detector
Battery Operated Smoke Detector Alarm for Home/Office/Hotels
- 10 Cm. Diameter X 3 cm. thickness; White Colour, Hard Plastic Material
- Single DC 9 V user-replaceable battery provides up to 18 months operation under normal conditions
- Integrated indicator provides visual indication of an alarm condition
- Test button verifies battery and alarm operation
- 30 day low battery warning signal
They are quicker at sensing smoldering fires than Ionization smoke alarms. A photoelectric type smoke alarm consists of a light emitting diode and a light sensitive sensor located in a sensing chamber. The presence of suspended smoke particles in the chamber scatters the light beam.