easy installation, almost perfect

Installation and commissioning of this doorbell is relatively simple.
The incoming and outgoing part of the same transmission code must be set by jumpers set (similar as in the hard drive on your PC). You can switch between multiple melodies, volume can not be adjusted. Whether the transmitter is waterproof, I can not judge this possibly will still seal itself.

1 special battery for the transmitter is included,
3 AA batteries for the receiver are not included.

Works seamlessly on floors or multiple concrete walls.

small flaw:

when receiving part missing in the battery compartment a few contacts without some tinkering the bell would not work

Nevertheless, due to the good price / performance 5 Stars.