Reach totally inadequate

Should the user the bell attach directly behind the front door, the device is super.
The operating distance of the doorbell ringing for were about 3 m. After that no more contact was made.
I have the batteries replaced for safety's sake on both sides to avoid mistakes in this area.
Unfortunately had no success. That's a shame, because the design is beautiful.
The transfer of an MP3 file, and the previous cut with the downloadable software worked flawlessly.
Incidentally, in the tests were no disturbing objects between transmitter and receiver. Only direct air line.

Conclusion: According to my tests the unit is unfortunately unusable for longer distances.