Wireless DoorBell No Battery Need Waterproof Door Bell Cordless Remote AC 110V-220V US Access Control

Features :

AC100-220V Battery-free wireless doorbell no battery need and no wire.
It uses unique energy harvesting technology and ultra-low-power wireless technology with worldwide patents pending.
Help you to save your money and power.
When users press the button, energy converting module inside will change the mechanical energy into electric energy.
Then the wireless module of the button sends the signals to receiver.The receiver receives the signals and plays music/react.

Specification :   WaterProof.    
Power: AC100-220V(receiver), Self-powered(push button)    
Working range: 120m in open area    
RF Frequency: 433MHz Volume: 3 files (can be mute)    
Sound Level: 85dBA'3ft (receiver)    
Power Consumption: 820mW (receiver)     
Operating Forces: 10N (push button)    
Dimension: 80×60×47mm (receiver), 79×44×33mm (push button)        
Ring Tone: 36 polyphony ring tones
Color: White ( ABS) Plug: US   Note: Press the pressure is slightly larger than the traditional doorbell, to ensure adequate power generation.