Self-powered Wireless Doorbell

DESCRIPTION This is a Wireless Door Bell, but No more battery needed or Worry battery runs out ! By pressing the push button, it converts kinetic energy into an electrical signal to ring your wireless doorbells. So no more worrying your push button runs out of batteries and no more hassling in buying awkward weird batteries to run your push button. You will always be able to hear your doorbells ring!Humanized and innowated design.Meet all your requirement! Long wireless transmission distance: up to 200 meters (no obstacles, in open field). Waterproof transmitter: can stand against heavy rain. Receiver is made of ABS plastic, inflaming retarding and environmental protection. Easy operation: the transmitter can be fixed on the wall by screws or adhesive pad and the receiver can be inserted to the power socket. 30 different polyphony ring tones for your choice. Wireless and battery-free: Do not need any battery or power line to charge the transmitter, and it transforms its own mech