I'm not a virtuoso of technique but I must admit that I put less than 30 minutes for my gigaset c 475 duo is operational, I love the choice of different ringtones to identify the numbers of friends and relatives and caller ID, the possibility of not having a bright screen, especially when the handset is placed in the chamber, As against the grip is not very practical, the support of the main copbiné presented flat not easy to read or access keys (in my previous gigaset model was tilted, netteement pous practice) and the second base station which is a bit étroit.Mais overall it is a very good product which I highly recommend, knowing that there is no perfect device.