Seven copies and we have gained. Four pieces with the optional wireless module and equipped three directly connected to PBX line. Thus we now have links all smoke detectors. The Assembly was well described simply and in the instructions. I have previously read in a recession customers that you insert the Battery would be difficult. At first I also thought that it might battery must push the side. But it was ultimately into clicked easily. Went without a problem and the battery is really well fixed. All in all I am very satisfied with my purchase. Become determined to accept another.
