The NICOR DOS180 is a vacancy sensor wall switch that uses passive infrared technology to determine when a room is occupied, or has become vacant. The DOS180 Vacancy Sensor replaces any existing on/off light switches that we?ve all become accustomed to. This makes installation a breeze. The DOS180 automatically turns lights on when entering a room, and off when leaving a room. The adjustable settings allow users to set time on/off delays, sensitivity settings, and also features adjustable ambient light level settings that are perfect for those who get up in the night and do not want to be blinded by normal light levels. This money saving switch is perfect for use in: bedrooms, bathrooms, closets, garages, kitchens, laundry rooms, and any other rooms or spaces that see frequent foot-traffic. Protected by NICOR's Limited 2 Year Warranty.