Europe style wireless ring doorbell for family or office
Specification:

1. Work Range: >120M in open area
2. Digital doorbell, about 20,000 different code
3. Frequency: 315 / 433 MHz
4. Soft Ding Dong / Golden Melody
5. Packing: Double plastic with card
6. Power:
   • Transmitter: 12V 23A battery x 1
   •  Receiver: AC110 or 220V