Compatibility Can be used with all known UK ‘single gang’ manual call points. Power requirements Sounder powered by a 3V lithium battery (supplied). Onboard Sounder Yes – 96dB @ 1 metre Product dimensions (mm) 96 W x 104 H x 32 D mm. Construction & finish UV-stabilised polycarbonate. Operating conditions/temperature Polycarbonate tested -40°C (-40°F) to 49°C (120°F).