This headband magnifier is designed in such a way that you can combine 2 lenses at the same time to increase the power however you wish. The lenses slip in and out of the lens holder easily, and the lens holder can be positioned wherever you need it. In the center for the double lenses, and over either eye for the single loupe lenses The frame rests gently against your forehead, and is held in place by a soft, comfortable, adjustable elastic strap. Double lenses are: 1x, 1.5x, 2x, 2.5x, and 3.5x. Single loupes are 5x, 8x and 20x. With the additional power of the LED light, you won't miss the smallest detail

* Light/lenses Can Move Horizontally - Lens Holder Extends An Additonal 3 Inches In Front

* Double lenses included 1x, 1.5x, 2x, 2.5x and 3.5x power magnificationcan- can use 1 or 2 together

* Single loupe lenses are 5x, 8x, and 20x power and can be worn 1 or 2 at a time to combine power

* This unit requires 3 "AAA" batteries, and battery compartment is located behind the head strap

* Lenses and LED light positions can be adjusted independently - adjust. Head band is soft & elastic