Connected doorbell and video door phone - Universal - The wireless DC shopping mall doorbell.(white) Highlights Universal The wireless DC shopping mall doorbell.(white) Wireless DC shopping mall doorbell Features: Drawing d simple and wireless installation Avoid problems during installation and do not affect the environment decorate. Remote control range up to 100m outdoor, suitable for home, office, hotel, etc. Build anti-interference desgin, avoid interference between users. Easy to install, no wiring required. Specification: Input Voltage: DC 3V Music Sound: 32 Melody Music Receiver: Power by 2 x 1.5V AA batteries (battery not included) Button: Use 1x 12V 23A alkaline battery (not included) The size of the remote control is about 72 x 38mm Door bell size is about 95 x 60mm