Feature:

1. USB Wireless Doorbell: Digital wireless DC doorbell, wiring free, plug and play, long distance reception. It has good performance.
2. 3 Adjustable Volume: Regardless of the balcony, kitchen, horizontal can hear, convenient for family use; 3 adjustable volume, the sound size as you wish.
3. 38 Ringtones Freely Switch: This doorbell comes with 38 ringtones to choose different exclusive ringtones for different neighbors, perfect for home use and as a pager for the elderly.
4. Multi Functional: Not only a doorbell, but also a pager, when the elderly, babies, pregnant women sleeping alone need, a press will know. Plug in the rechargeable battery, can be moved at any time.
5. Strong Signal Long Distance Reception: Can penetrate 3‑4 walls, open distance range up to 150 meters, in open areas, ideal for large houses, including villas, apartments, offices, stores, warehouses, etc.

Specification:

Item Type: Wireless Doorbell
Weight: 77g / 2.72oz
Commodity Material: ABS
Emitter Operating Voltage: 5V (USB power supply)
Power Consumption: <0.25W
Operating Frequency: 433.92 MHz
Operating Temperature: -10°C~+45°C
Controllable Volume: ≥50dB/1m
Remote Control Distance: >150m (open space without obstacles)
Transmitter Battery Type: CR2032, 1 x button cell 

Battery Capacity: 160mAh (shipped with built in battery)

Transmit Power Consumption: <10mW

Package List:

1 x Transmitter

1 x Receiver

1 x Double Sided Adhesive

1 x Instruction Manual