These headset glasses allow unrestricted user efficiency while reducing eyestrain. They leave both hands free, offer a wide field of vision and can be worn over prescription or safety eyeglasses. When not in use, they can be tilted up out of the way. There are 4 different magnifying multiples: X1.5, X3, X8.5 and X1.0. The headstrap is easilly adjustable. These also have the benifit of there own LED lights, leaving your hands totally free. These glasses have many uses from checking circuit boards to reading resistors plus all the other industries that require close magnification.