Mercury Smoke detector w/hush button

This unit detects initial smoke formation with its sensitive photoelectric system and signal processing circuit giving an alarm signal as an early warning. Photoelectric alarms are less likely to trigger a false alarm from Kitchen or bathroom steam than traditional ionization alarms. This model also has a hush feature to reduce the unit's sensitivity for a ten minute period when needed.Battery[tab]1 x 9V PP3 (supplied)[br]Alarm output[tab]85dB @ 3m[br]Mounting hole centres[tab]70mm[br]Dimensions[tab]34 x 101mmØ[br]Weight[tab]136g (with battery)[br]Static working current[tab]<12µA[br]Operating temperature[tab]-10 to 40°C