The Motion Activated Door Key Light is a door lock light designed for use by individuals who have low vision. The unit has four bright LED bulbs that activate by motion to illuminate the keyhole, making is easier to find in the dark. Features include automatic shut off after six to eight minutes. The device mounts on the door with double-sided tape or screws (included). POWER: Uses 1 AA battery. DIMENSIONS (WxH): 3.125 x 1.5 inches.