HLM-7USB Dual LED Headband magnifier rechargeable lithium battery and 5 lens set with our ultra comfortable wetsuit type padded headband. This model utilizes a dual acrylic prismatic lens system and lightweight easy to adjust head strap, dual led light module is angle adjustable to allow the perfect illumination of the working area This headband magnifier is one of our finest quality and is suitable for light industrial use, and is ideal for detailed tasks that require magnification and hands to be free to work. Includes 5 lenses - 1x,1.5x,2x,2.5x, 3.5x in lens storage case. Requires 3 "AAA" Batteries. Identical to the HLM-7 except this model has a rechargeable battery system