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The concept of a batterie free remote control uses piezo cristals and creates energy out of the movements of your finger to keep the remote control running/get the remote control working.
To handel a remote control you use your fingers and push the buttons. And only
when you actually use the remote control you need energy. Still, every remote control has
The concept of the piezo remote shows a possibility of a battery free remote, which get its energy from the kinetic energy you create while pushing the buttons.