After a week of using this Avantek kit: no problems :-)
Housed in unfavorable conditions (an armored door, a normal door and a wall between the button and the chime), this kit works well.
The 52 proposed melodies are a little gadget, and some are really awful, but at least there's something for everyone .. I personally remains 'ding dong' traditional.
Volume level is good too: you really do it on purpose to not hear it.
Finally, the something extra that really deceived, but the battery box remote: that's really practical when you size the roses in the garden, or simply when we go to tea (or aperitif) in its neighbor to overcome!
The normal price of fifty euro seems fully justified to me, the discount price of 26 at the time I am writing this review makes it a very good deal.
Erwann on Amazon.com