Dahua Alarm Wireless Sensor For Smoke HY-SA21A-W2(868)

Split-spectrum sensor technologyTest and silence features in one single buttonLoud sound output over 85 dB(A) at 3 metersLow quiescent current consumptionSurface-mount device (SMD) circuit board designLow battery warning signal—Working PrincipleCollection Type : SmokeSampling Period : 10 sSensor Type : PhotoelectricAlarmAlarm Type : Smoke alarm, fault alarm, low battery warningAlarm Volume : 85dB–90dB(A) at 3 mAlarm Mode : Visual and audible alarmSilence Function : YesSilence Duration : About 12 minAlarm Response Threshold : 0.2 dB/m – 0.3 dB/mBasic ParametersIndicator Light : Red and green LED indicatorLed Instructions : Standby: Green indicator flashes once per minute / Alarm: Red indicator flashes once per second / Fault: Red indicator flashes once per minuteLow battery warning: Red indicator flashes once per minute : Coverage AreaWhen the height of the space is less than 8 m , the protection area of a device is 20 m2–40 m2Power SupplyBattery Life : 3 yearOperating Voltage : 3V CR123A lithium battery (replaceable)Operating Current : Monitoring current: ≤ 35uA / Alarm current: ≤ 35mAOperating AmbientOperating Environment : IndoorOperating Temperature : -10°C to 55°COperating Humidity : ≤ 95% RH (non condensing)AppearanceColor : WhiteCasing : ABSDimensions : φ98mm × H43.1mmWeight : 140 gInstallation : Ceiling MountCertificationsCertifications : TÜV and CE listedCompliance Standard : EN 14604:2005 AC:2008Wireless Carrier Frequency :  868 MHz–868.3 MHzCommunication Distance : Up to 1000 m  in an open spaceCommunication Mechanism : Two-wayFrequency Hopping : YesEncryption Mode : AES128—