No Battery Required Wireless Doorbells, Innoo Tech Weatherproof Door Bell Chime with 2 Receivers, 500 Feet Electric Doorbell, White Self-Generating Power】No batteries required at all even the transmitter. High performance transmitter with ultra-low power consumption. Do not have to uninstall the transmitter when battery is exhausted every year comparing to traditional wireless door bells. Please try to avoid installation the device under rain, over expose to sun or close to metal, otherwise it will interfere with the wireless magnetic field.
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