At first I was happy to have found the combination of Tel. + Matching handset. Unfortunately, the phone does not have instructions for use is, therefore, rather fumbling. Unfortunately, it can also not be digitally integrated into my CRS system. The handset does not go. Either the battery is broken or the contact. Too Bad. If I need to install not experts (and the associated costs), I would have returned it. So I will now probably simply dispose of the handset.