Working PrincipleCollection TypeSmokeSampling Period10 sSensor TypePhotoelectricAlarmAlarm Type Smoke alarm, fault alarm, low battery warning Alarm Volume85dB–90dB(A) at 3 m (9.84 ft)Alarm ModeVisual and audible alarmSilence FunctionYesSilence DurationAbout 12 minAlarm Response Threshold0.2 dB/m - 0.3 dB/mBasic ParametersIndicator LightRed and green LED 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 Life3 yearOperating Voltage3V CR123A lithium battery (replaceable)Operating CurrentMonitoring current: ≤ 35uAAlarm current: ≤ 35mAOperating AmbientOperating EnvironmentIndoorOperating Temperature-10°C to +55°C (+14°F to +131°F)Operating Humidity≤ 95% RH (non condensing)AppearanceColorWhiteCasingABSDimensionsφ98mm × H43.1mm (φ3.85" × H1.70")Weight140 g (0.30 lb)InstallationCeiling MountCertificationsCertificationsTÜV and CE listedCompliance StandardEN 14604:2005+AC:2008WirelessCarrier Frequency868 MHz–868.3 MHzCommunication DistanceUp to 1000 m (3280.84 ft) in an open spaceCommunication MechanismTwo-wayFrequency HoppingYesEncryption ModeAES128