Self-generating Doorbell Clock Hygrometer Integrated Room Temperature Wireless Doorbell Pager Video Doorbell

Self-generating Doorbell Clock Hygrometer Integrated Room Temperature Wireless Doorbell Pager Video Doorbell Is wireless calling with motion buttons a smart and full-featured transmission device? No batteries or wires are needed to send out a signal. The call is very informative as it displays the current time, humidity and temperature. The button uses unique energy harvesting technology. When the button is , the internal energy conversion module converts  energy into electrical energy. The button's wireless module then sends a signal to the receiver. The receiver receives the signal and turns the ringer power on/off, then the ringer is heard. The new generation of doorbells work by synchronizing sound waves via radio frequency. No  installation, networking or maintenance required. You  it easily without the help of an. The wireless doorbell with motion button on the door guarantees excellent hearing at a distance of up to 200 meters! Includes: reflector*1 buzzer*1

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Material: plastic