Radio smoke alarm radio heat detector smoke detector battery life 1 year series logilink casa safety features self test test button number of batteries 1 operating voltage 3 v noise level 105 db ansprechtemperatur 54 70 c signal range building in m 25 m signal range outdoor in m 100 m min operating temperature 0 c max operating temperature 40 c permitted humidity when in use 10 85 diameter 120 mm height 53 mm included in delivery batter