MEET DIFFERENT MAGNIFYING: With 4 Replaceable/interconvertible magnification lens, 1.5x at 15" Focal Length/2.0x at 10" Focal Length/2.5x at 7" Focal Length/3.5x at 6" Focal Length. SPONGE DESIGN: Soft and Light, breathable sponge inside will make you will feel comfortable when operating, even if you work and wear it for a long time, it will not put pressure on your head. ADJUSTABLE HEADBAND: Hands free handband strap improves comfort when wearing, two knobs on both sides can adjust the height of the magnifier to meet your request view angle. easily fit your head without discomfort. WIDELY APPLICATION: Hands-free multi-power combined lens magnifications meet your variety requirement use: jewelry making, reading, painting, observing, watch-making, repairing, beading, close work, needlework, artwork, and other hobbies/crafts. A very important visual tool for persons involved in the watch, delicate instrumentation and small work. ADJUSTABLE VISOR: Visor can be tilted up and down as needed, and moved out of the way when no longer required. Can be worn over prescription glasses or safety goggles.