The detectors fulfill exactly its purpose. Have integrated into an existing group of 3 identical detectors which set of 2. The pairing is a bit cumbersome, but if everything has been successfully tested, the detector will sound very reliable. Changing the battery after about 1 year. Attention - then both the 9V block battery and the Mignon change (1 x for detectors such as, 1 x for radio). Too bad that there is no kitchen detectors for the series, which you can disable by button for a short time. Thus, one should separate the detector during frying pan with steam or other development, otherwise it will sound the alarm and thus go all the other detectors in the house ...
