Detector type: opticalAlarm volume : > 85dB at 3 metresSuitable for rooms from 20 to 40 m2Break time: about 9 minutesWith test button and pause buttonWith battery indicatorBattery: 3VDC CR123A Lithium, replaceableBattery life: 1 yearOperating Temperature: -10 ~ 40°COperating Humidity: 25~85%Including mounting materialApproval: VDS 3131/ G216009, EN14604