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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!