Item Specifications Power Supply DC 9-15V battery not included Detection Range 4-8m Volume 4 levels adjustable Cannot adjust volume in alarm mode Induction Method infrared sensor triggered 3 Modes Voice Alarm Music Voice Mode Human Voice Welcome Light Alarm Mode Keeps you aware of intruders Music Mode Just like a doorbell with 32 music to welcome your guests Ambient Temperature/Humidity 10-40℃, 5-95% RH Detection Angle Horizontal Angle of 110 degrees, Vertical Angle of 15 degrees Main Function Automatic body sensing, ultra-long wide-angle detection, adjustable direction with stand, host built-in speakers, alarm volume of 75-95db Installation No need professional personnel, easy to install yourself Installation Height 1.5-2.5m Music 32 music and song optional Size Height 7.5cm, Width 8cm, thickness 4.5cm with base, base can be flat or fixed on top Battery 3 x AAA batteries batteries not included Package Contents 1 Welcome Alarm Doorbell white color with detail box 2 Screw 1 Bracket 1 Double-sided Adhesive 1 Blocking carton