Specifications:
Rated voltage: AC 110V - AC 240V, 50-60Hz
Volume: 2-85dB
Working frequency: 433Mhz
Receiver standby power: <0.5W
Transmitter power: Self-powered (no battery required)
Transmitter power: <10mW
Package List:
Wireless doorbell 1 Receivers(plug in) + 1 Transmitter(Self-Powered,No Batteries Required)