Working PrincipleCollection TypeSmokeSampling Period9 sSensor TypePhotoelectricAlarmAlarm TypeSmoke alarm, fault alarm, low battery warningAlarm Volume85dB (A) at 3 m (9.84 ft)Alarm ModeVisual and audible alarmSilencing FunctionYesAlarm Response Threshold0.2dB/m-0.3dB/mBasic ParametersIndicator LightAlarm, fault and operation indicatorLed InstructionsStandby: Green indicator flashes once per minuteAlarm: Red indicator flashes once per secondFault: Red indicator flashes once per minuteLow battery warning: Red indicator flashes once per minuteCoverage AreaWhen the height of the space is less than 8 m (3.28 ft), the protection area of a device is 20 m2–40 m2Power SupplyBattery Life10 yearPower Source3V CR123A lithium battery (replaceable)Operating CurrentMonitoring current: ≤ 15uAAlarm current: ≤ 35mAOperating AmbientOperating EnvironmentIndoorOperating Temperature-10°C to +55°C (+14°F to +131°F)Operating Humidity≤ 95% RH (non condensing)AppearanceColorWhiteCasingABSDimensionsφ98 mm × H43.1 mm (φ3.85" × H1.70")Weight136 g (0.30 lb)InstallationCeiling MountCertificationCertificationsTÜV and CE listedCompliance StandardEN 14604:2005+AC:2008