Features: 1.Changeable Volume: The wireless motion door bell has four volume levels from 0 to 110 dB, adjusting the volume according to the user's needs for greater comfort. 2.Remote Infrared Sensor: Wireless motion detector features remote infraed sensor, with detecting the passers by in the eight metres, improving the security of shop. 3.High Siren: There is a 110dB siren installed in the gate entry alarm, greatly alerting the householder of guests and theft, which can make them prepare. 4.Wide Application: Motion Alarms have a wide range of applications in various industries and environments. It can detect movement in the surrounding areassuch as door entrance, gallery, gate, walkways, apartment, office, hotel, shop and many other indoor places. 5.Easy to Install: You can simply place the detector on the table or peel off the double sided tape on the back and stick it to the area you want to detect. Specification: Item Type: Intelligent Welcome Doorbell_x000D_ Material: abs_x000D_ Color: White_x000D_ Feature: Infrared Sensor_x000D_ Battery Type: 7 AAA (Not Included)_x000D_ Remote Control Battery Type: CR2025_x000D_ Remote Control Battery Capacity: 170mah PackageList: 1 x Remote Control 1 x Rubber Pad 1 x Gummed Paper 1 x Doorbell 1 xInstallation Package Note: Product requires 3 AAA batteries