HVM-4LED-3.5x LED Premium Binocular Headband Magnifier Visor that comes with 3.5x lens & a 4 " Focal Length, other lenses available & the popular Optivisor lenses you may have lying around will work in this headband magnifier, This is rechargeable 4 LED Version of our most popular model the durable HVM-4 this model has medium power 3.5x magnification, and a high magnification lens with 4" working distance, updated padded headband and adjustment mechanism make this more durable and comfortable to wear. Updated ergonomic design makes this easier to use and adjust to fit any size quickly and easily, visor is also adjustable +/- 60 degrees either way making it easy to flip up and out of the way of the line of sight. The HVM-4LED premium features an updated heavy duty pivot hardware design as well as scratch resistant optical glass prismatic lenses, Quad LED adjustable angle USB rechargeable led light, lightweight yet durable impact resistant visor shell more suitable for the industrial environments. Can be worn over eyeglasses and many safety glasses. Other lens magnification options are available for purchase for the HVM-3, HVM-4 HVM-4LE. One eye swivel loupe options are available including MADE IN USA Donegan models. Our standard size lenses will also fit many other headband magnifiers including OptiVISOR® Brand. If you currently have a Donegan Optivisors all of your lenses will fit this model.