Features:
* Unique doorbell with motion sensor detector that triggers the doorbell main unit.
* Motion sensor range area is about 7 meters area at an angle of 110 degrees, operating range is about 100 meters (open place).
* Independent alarm horn, maximum 110d B.38 different ring tones, volume is adjustable.
* Receiver host easily plugs into an electrical outlet, motion sensor uses 3*AAA battery (not included) or micro USB (Universal Serial Bus) power supply.
* Applicable to all kinds of shops, hotels, offices, factories, homes, etc.