Blue White Housing Wireless Infrared Sensor Welcome Greeting Doorbell Product Name : Welcome Doorbell;Powered By : 3 xAAA1.5VBattery (Not Included)/ DC 9V Power Supply;Detecting Distance : 1m-5m;Adjustable Volume : 3 Class Speaker : Built-in Speaker;Induction Method : Infrared Sensor Trigger;MeasuredAngle : Horizonta:110 DegreeVertical:60 Degree;Alarming SounDepth : 75-95dB Music : 16 Type;Doorbell Size : 8.4 x 4x 9cm / 3.3" x 1.6" x 3.5" (L*W*H);DC Power Supply Cable Size : 140cm/ 55" Plug Type : US Plug;DC Power Supply : Input :AC 100-240V, 50/60HzOutput: DC 9V , 1A;External Material : Plastic Color : Blue, White;Net Weight : 219g;Package Content : 1 x Welcome Doorbell1 x DC Power SupplySome Installing Parts