Dorcy 41-2089. The Dorcy Button Cell-Battery 5MM LED Deluxe Headlight features a comfortable and adjustable elastic strap that allows the user hands-free use. This headlight is multi-functional and can be worn on the head with the elastic head strap, or worn on the arm with the arm band. This headlight had a twist on and off switch to protect from accidental usage when stored. This multi-use headlight includes batteries - dual function allows use as a headlight or an arm band.