Package includes :
1 x Indoor Receiver
1 x Outdoor Transmitter
1 x English User Manual
1 x Double-sided Adhesive Tape

Specification :
Waterproof.
Power: AC100-220Vreceiver, Self-poweredpush 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
Dimensions: 80×60×47mm receiver, 79×44×33mm push button
Ring Tone: 36 polyphony ring tones
Color: White ABS
Plug: EU

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.

Note: Press the pressure is slightly larger than the traditional doorbell, to ensure adequate power generation.