This wireless doorbell is very easy to install. 
Connect the receiver and mount the transmitter
at your door with the supplied materials:
your doorbell is ready to use!
Options
* Transmitter with battery provides easy installation without wires
* Maximum range of outdoor operation. 300 m
• 80 dB doorbell, which is clearly audible throughout the House
* Large selection among 36 melodies
* Option to choose Sound and light or just sound or light