DescriptionBrand Name : Origin : Mainland ChinaSmart home platform : NONECertification : CEModel Number : GS04Type : Smoke Detectortype : Smoke Detector Alarmfrequency : 433MHZUsage : Fire smoke alramAlarm Sound : 80dBmaterial : ABSWorking Voltage : 9VFeature1 : linkage smoke can work with alarm systemFeature3 : Easy to Use and install Smoke Alarm Fire Protection Smoke Detector Combination Fire Alarm Home Security System FirefightersNoteLinkage Smoke Can Work With Alarm System or Work IndependentLinkage SmokeRhotoelectric smoke sensorBuilt-in new photoelectric smoke sensor is more sensitive. 80dB alarm tips, ahead of the forecast fire.Remote alarm (linkage Smoke )Can be used independently, but also encoded with alarm system. Through the linkage with the alarm host, triggering host remote call and SMS notification when in emergency situations.Package IncludeLinkage Smoke detector*1/3 (Battery not include)it can work independent and can also work with our alarm system