Wireless Self-powered Doorbell, No Battery Required A Self-generating Doorbell

Multiple songs Music ringtones, volume adjustment.
Press to generate electricity, no battery required, strong signal, long distance.
Easy to install and to use.
Home Safety. Energy saving and environmental protection.
Super loud wireless doorbell, a homemade smart wireless doorbell, (simple installation without battery)
Installation details:
Take out the product and plug the indoor unit into the mains socket. Pay attention to whether the blue light indicator of the bell guide decoration flashes on the indoor unit. If the blue light flashes on the indoor unit, the indoor unit is working normally;
Press the call button on the outdoor unit transmitter to check whether the indoor unit is ringing normally. doorbell.
During the test, the indoor unit will ring the doorbell normally, indicating that the product is working normally