Outdoor dusk to dawn floodlight control. For use with halogen, CFL (compact fluorescent), and LED (light emitting diode) bulbs. Long stem design fits inside most floodlights, spotlights, or enclosed exterior fixtures. Screw-in for easy installation. Saves energy and extends bulb life. Ideal for driveways, entrances, and patio lights. 3.35 In. W. x 4.3 In. L. x 3.35 In. D.