Mr. Beams Wireless Motion Sensing Ultra Bright LED Spotlight with Photocell Sensor. Attach your Ultra Bright Spot Light to any fence, post, tree, or home without needing wires. Simply insert 4 D-Cell batteries, and mount the base to your desired surface. Installation can be done by anyone in less than 5 minutes. The Ultra Bright Spotlight is activated whenever motion is sensed within 25 ft. The activation will allow you to see down your driveway, illuminate your backyard or scare pesky burglars. Battery life expectancy is 1 year with 6-8 activations a day. In order to conserve battery life, there is a built in photocell sensor and auto shut-off timer. The photocell sensor is what prevents the light from activating during the day and the shut-off timer will force the light to deactivate 20 seconds after the last motion is sensed. The bright LED provides 300 lumens of bright white light that will last 25+ years. The bright LED never needs replacing it's so efficient that you will get more than 1,800 activations on one set of batteries. Tight seals and weather-resistant materials allow a Mr. Beams Ultra Bright Spotlight to work in all weather conditions. Don’t waste your time or money on hiring an electrician. Put the bright LED power into your own hands, and install your Mr. Beams Ultra Bright Spot Light in less than 5 minutes.