The listing, Head Piece With Magnifying Lens for Crafting has ended.
I used this several years ago while handcrafting jewelry. The light does not work and it isn't the batteries so I am assuming it must be the bulb but I never tried to find another one. I used it for a long time without the light and it was fine. There are 4 different strengths of lens and you can see them on the case that holds them. The headband is adjustable. I no longer need this because I now use a gooseneck lamp with a magnifier in the lamp.