After four weeks, and some test's I can confirm ... that's a product that delivers what it promises.
Unfortunately not available at the moment :-( whatever reason).
Now I just hope that this product is really only temporary -Not availability.
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15/03/2015
Property me two (because 2 inputs) ordered it, and am so far impressed.
Had with my order of two devices is a fear that the frequencies could overlap and interfere.
Everything was wonderful, every single unit works perfectly!
Total light adjustment and what is most important - this wireless doorbell makes what I have set.
Have a small roof built over each station, because I could not find anything in the description, unfortunately, that stations have weather safely.
Last but not least .....
The elegant appearance of the bell push that does not freeze or get jammed by the way can (touch technology), are a delight for my visitors :-)
If my "AVANTEK DT41" now even the long-term test, there's me again to star.