CINBOS Door Alarm for Home/Office,Wireless Door Open Chime Range 656 Feet/52 Chimes/4 Level Volume/LED Indicator Home Security Window Entry Alert Doorbell (2 Sensor + 2 Receiver)

When the two parts of the door alarm sensor are separated more than 1.2 inch, door sensor will be triggered, then the receiver will get signal from the sensor.

CINBOS Door Alarm for Home/Office,Wireless Door Open Chime Range 656 Feet/52 Chimes/4 Level Volume/LED Indicator Home Security Window Entry Alert Doorbell (2 Sensor + 1 Receiver)

When the two parts of the door alarm sensor are separated more than 1.2 inch, door sensor will be triggered, then the receiver will get signal from the sensor.

Door Alarm for Home/Office, Cinbos Wireless Door Open Chime, Range 656 Feet/52 Chimes/4 Level Volume/LED Flash Expandable Home Security Magnetically Triggered Window Entry Alert Doorbell

When the two parts of the door chime sensor are separated more than 1.2 inch, door sensor will be triggered, then you will hear the ringtone from the receiver.
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