The small size is great, the processing also. The ability to use the detector even behind glass, etc. makes it considerably more convenient than the conventional infrared motion detector for many applications. However, this feature is unfortunately only theoretical. Once a conventional washer is in between (and the detector is placed directly behind the wheel), reduces the use Radius to about 30 cm. If this is also is safety glass, it dissolves only when pressed with the full hand against the glass. As a motion, which is to deter unwanted visitors so far totally inappropriate! In space, behind a very thin barrier it works very well. For a staircase or so far very good. From the house-inside in the garden, no matter how thin slice or window frames are not, so unfortunately only two stars because especially this property the model really stands out from conventional detectors.
