Solid brass. Light activates when motion is detected, light timer shuts off light after selected time of 1, 5, or 10 minutes after motion stops. Automatic photocell deactivates unit in daylight. Pulse count technology reduces false sensing from wind and rain. Manual override turns light off or on with existing indoor wall switch. Allows light to stay on continuously all night when needed. Up to 30 ft range from hidden 150° motion sensor. Uses one 100 watt medium base bulb. Meets the ENERGY STAR guidelines for energy efficiency. 18.875 in height x 5.875 in width x 6.375 in depth.