The Optivisor Visor Light attachment adds a bright, Xenon laser beam of light to illuminate your work area.It easily clips onto your Optivisor.The light adjusts up and down to ensure that maximum light is on the work area. Twists on/off to extend battery life, and will provide 4-6 hours of light. Powered by two "AA" batteries (not included). The battery compartment is 2-1/2" high x 1-1/8" wide x 3/4" thick. Cord length -10".