Smart Wireless Doorbell Remote Response Signal Stabilization Volume Adjustable Ease Of Installation USB Power Supply Call Button Features: Product Name: Smart wireless doorbell Product color: White Material: ABS Product gross weight: 136g/0.3lbs Product packing size: 10.8*10.8*9.5cm/4.25*4.25*3.74in Transmission distance: 150 meters Product Description: USB interface wireless smart doorbell,no need to arrange wires,plug and play,receiving distance.Open line 150m distance reception,three-speed volume adjustment,and durable. The smart doorbell transmitter is easy to install and can be fixed to the wall at the door.The receiver is powered by USB interface and can be connected to the mobile power supply at will,which is very convenient. The signal is strong and the reception distance is long.It can penetrate 3 to 4 walls and has an open range of 150 meters.Ideal for large houses,including villas,apartments,offices,shops,warehouses,etc. 38 chords ringtone can be switched,choose a different doorbell ringtone and neighbors,not afraid to hear the wrong ringtone,doorbell does not crosstalk.Third gear volume can be adjusted for easy family use. It's a doorbell and a pager.When the elderly,babies,pregnant women need to press the doorbell button,can be used as a pager. Package Include: 1* Smart wireless doorbell 1* Doorbell receiver 1* Specifiion Add color to your life and make it more colorful. A little helper in your life. This is a good product. Makes a great gift for family and friends. Beautiful appearance,let people feel visual enjoyment.