Sorry! In both sets, so at 8 smoke detectors, all batteries were weak or not loaded / inoperable. On my complaint spare detectors have been delivered to me, but even with these the same problem; All batteries were not loaded. Then I complained and asked me just once to provide a corresponding number of functioning batteries. Unfortunately, the response from Amazon- -so this was not possible !!! So I had to buy a corresponding number of Bloch batteries themselves, although in the tender for the smoke detectors was "... batteries ..." indicated. Incremental costs that are unnecessary. As a good customer of Amazon, I'm very disappointed !!
