For proper hand part, I will not continue writing because I can join only the positive impression of other reviews. Important for me was the good integration with the DECT base in the Fritz box (in my 7390 with Fritz! OS6.23). This is (almost) perfect success, the only downer, I've found so far is that the telephone directory of the Fritz box can not be directly synchronized with the phonebook of the handset and accessed directly using the key. Access is via a small detour: you have to press the intercom button longer, then displays a list of internal phones (incidentally, in plain language, how they are stored by name in the Fritz box), and this list will also "Phone Book" what then exactly is the phone book of the Fritz box. If you choose the out, you get the list of items presented. That's not quite as comfortable with Search, etc., but still accessible. This justifies in my opinion but no star deduction ;-) The answering machine is perfect and seamless integration. Calls also works very well ;-) All in all a very positive impression so far, if there anything else should arise, I will supply later it accordingly.