Automatically turns on lights at dusk and of at dawn Easily installed in any existing screw type light socket Saves Energy and Improves Security using Photo Cell Technology Works with incandescent light bulbs 100w or less For Indoor or Outdoor use Does not work with Compact Fluorescent Light Bulbs (CFL) Adds protection-making your house look occupied Saves energy by reducing light fixture operating time Black Color EASY INSTALLATION: Turn desired light socket Off. Screw in Auto-sensor Light Socket. Install incandescent light bulb (maximum 100w). Make sure desired light socket is left in On position. The light sensor will automatically begin working. For use in 3 way light sockets: Set the Switch to the highest setting. Screw in Auto-Sensor Light Socket. The light sensor will automatically begin working. To Test: Cover auto sensor window of light socket. Light should turn on. Remove cover, light should turn off.