Self-powered 1 Receiver 1 Transmitter Wireless Smart Doorbell Home Dingdong Music Electronic Doorbell Pager

Specification:  Carrier frequency: 433.92MHz;  Pressing force: <5N;  Standby power consumption: 0W;  Service life: >200,000 times;    Receiver  Carrier frequency: 433.92MHz;  Transmission distance: about 60 meters in an open area;  Voltage range: 110V—240V AC;  Ringer volume: 100dB;  Plug specifications: American regulations, Chinese regulations, British regulations, European regulations Audio settings: 4 audio settings ( maximum-medium-minimum -> mute );  Package Includes:  1 * Wireless Smart Doorbell;