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) 116 W x 138 H x 64 D mm. Construction & finish UV-stabilised polycarbonate. IP Rating IP56 (can be used indoors and outdoors) Operating conditions/temperature Polycarbonate tested -40°C (-40°F) to 49°C (120°F).