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Traditional Doorbell emitter works with battery, users need to change battery regularly. Repeated purchasing and using of battery not only cost money, but also pollute our environment. 


Reliability of traditional emitter is also worried by people because usually they are using cheap wireless solutions which can not work stably for longtime. 

And battery emitter using environment also have limit of temperature and Humidity. 


RF & Energy Harvesting Technology, removed all these worries, no wire, no battery, no limit, stable, waterproof, endurable, reliable... 

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