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In the market, most transmitter are typically powered by batteries, so the users have to consider the battery life and whether the batteries are easily replaceable. Now you have a new option of our kinetic wireless doorbell, it works without any battery. You can know more from my following introduction: - Flash Wireless Doorbell chime is power by 3*1.5V AA battery,  the lifetime of battery is one year.  - Transmitter is self-powered with kinetic technology, it generate electricity by itself continuously when press the bell push button by finger, the lifetime is as long as 20,0000 presses. - Operating range up to 150 metres on open air, which is applicable for villa, multi-story houses or big property.            - The transmitter is waterproof IP44, better suited to withdraw tough working environment.                                    &nb…

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