The Screw-In Light Sensor Control senses light levels and automatically turn lights on at dusk and off at dawn. Put an end to coming home to a dark house with this screw-in light control that simulates home occupancy and deters intruders. Additionally, light controls add to the energy efficiency of your home for indoor use only. This product comes with a 1 year warranty. Our products are uniquely designed and affordable, so make the right choice with "Good Choice". Good Choice products have been awarded The Good Housekeeping Seal of approval. The Good Housekeeping Seal has been reassuring consumers about their product purchasing decisions for over 100 years and is one of the most recognized consumer emblems in the market today.