Smoke detector is a device that detects smoke, typically as an indicator of fire. Commercial, industrial, and mass residential devices issue a signal to a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible and/or visual alarm from the detector itself.
Alarm sound:>80Db ( within 3m)
Working humidity: <95%RH
Wireless frequency: 433MHz
ATTENTION: This sensor can't be used independently. It needs to work with the panel which is the same as this sensor's parametter. And it is not universal for all the panel.