The Piano,a self-powered wireless doorbell, which is easy to install and environmentally friendly, no cables or batteries. As is known to all, battery-powered devices can be costly as batteries need to be regularly replaced, can harm the environment and must be disposed of properly. When you press the doorbell,it will transmitter spontaneous electric with built-in sensor through the electromagnetic induction principle, and emits the wireless signal, transmission to the indoor plug-in receiver. An indoor receiver can receive signals from two or more wireless doorbells, and the user makes a different music from the receiver to distinguish visitors from different locations. The powerful wireless signal transmission capability of the transmitter and receiver can be configured according to different scenarios.
The emitter appearance design is integrated into the piano key elements, to makes the user like playing a beautiful piece of music, which offers a better Interactive experience.

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