After buying several models of this type of detector LED, I have finally found my happiness with it to the point den buy 7 others and den have everywhere. A The reverse other models, the detector really lights up when the brightness of the room is at a minimum and so do not act on day switch (by setting it to OFF) to try déconomiser 3 AAA batteries not included. Switch with three positions: ON AUTO OFF The sensor may be placed on a desk, tabletop or be wall via three screws and plugs. The ball is where the motion detector and 9 white LED, can once placed on its support be directed almost as you see fit. This is thus a product of a excellent quality / price I highly recommend. A tip: expect the evening to test the product because in the same day by placing your hand over the sensor (switch to AUTO) it is sometimes difficult to make sallumer.