Deta 1163 Optical Smoke Alarm 240V with 9V Replaceable Battery Back Up (White)

Optical (photoelectric) smoke alarm - less prone to false alarms. Alarm volume >89dB(A) @ 3m. Silence / hush button Power on / alarm status indication lights. Mains powered 220-240V AC 50Hz. Replaceable 9V PP3 battery back up (battery included) Push fit mounting base for quick and easy installation - no separate base required. Dust cover to prevent dust contamination during building works. Up to 12 alarms from same manufacturer / range can be linked together No radioactive content. Fitted gasket on back of base plate. Class II double insulated. Earth "park" terminal included in base. Manufactured to BS EN14604: 2005 / AC:2008. CE approved Dimensions: 140mm diamter x 60mm deep, Weight: 0.7495716908 Pounds, Manufacturer: Deta Electrical Co Ltd