Motion sensor light turns on automatically whenever anyone Approaches! Cordless electric unit has 7 super-bright, energy-saving LED bulbs that add welcome light to dark areas, indoors or outside. Adjustable light comes on when motion is detected and stays on for 30 seconds at a time. Needs no wiring; uses 3 C batteries (not incl.). Has on/off switch and “keyhole” hang hook. 5 7 /8" L x 3 3/4" W x 2 1/2" D when closed.