New and High Quality Guest welcome device&anti-theft alarm doorbell: when the guest is into the detection range, welcome your guests with beautiful song or human voice automatically; motion detector, alarm triggered by motion, keeping you aware of intruders or visitors anywhere around your home. 32 different sounds for choice, you can change the music by the music selection button. Volume adjustment: 3 level of adjustable sound volume, press the button and adjust the volume. 3 modes for your choice: doorbell mode, music mode, alarm mode. Strong sensitivity, good drop resistance, sound sweet. Easy Installation: With the double-sided adhesive sticker, you can stick the door bell anywhere you want, or you can use the screws to fast the door bell on the wall, wood board, aluminum board etc. Wide usage scope: Suitable for dwelling houses,apartments, shops, offices, factories and so on. Specifications: Power supply : AAA batteries (battery not included) Detection range: 4-6m Volume: 4 levels adjustable (Can't adjust volume at alarm mode) Induction method : infrared sensor triggered 3 modes: Voice Alarm Music,at "Voice" mode: Human voice,dingdong,ninhao,huan ying guang ling;at "Alarm"mode: keeps you aware of intruders;at "Music" mode: just as a doorbell,with 32 music to welcome your guests Ambient temperature/humidity : -10 -50 degree Detection Angle: Horizontal Angle of 110 degrees, vertical Angle of 15 degrees The main function: Automatic body sensing , ultra-long , wide-angle detection. Adjustable direction (with stand). Host built-in speakers, alarm loudness of 75-95 db Installation : No need professional personnel, easy to install yourself Installation height: 1.5m-2.5m Music: 32 music and vocals optional Size: Height 7.5cm Width 8cm , thickness 4.5 cm (with base - base can be flat or fixed on top) Battery: 3 x AAA batteries (batteries are not included) Package Included: 1 * Doorbell