My honest opinion about this device, I can only say it's a letdown. The alarm can deter any intruders, (because of loud) chirps like a canary. The main disadvantage is, however, that in each window opening of the front lid has to be removed in order to arrive at the on and off switch. The sticking is simple, but in the narrow counterpart it is a shaky affair. In a word, the power is only expensive, as alarm in my view, totally inappropriate. One more tip, got me down rausgeschnitten a small window, so I at least on and off without removing the cover (stiff) can.
