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Wireless Call Button Without Battery to Save the Earth

Have you ever tired of changing the wireless call button? Have you ever trapped with the short working distance of wireless call button pager? Have you ever be distressed with damp damaged wireless call button in your restaurant? Retekess list one new call button with self-power now? Press the call button-wireless pager without battery, and then transports with one wireless pager amplifier converter, the signal will be extended up to 500M in the open area,  ...

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