Frees your hands so you can get down to work. Flip-up lens design lets you change between four magnification levels: x1.8, x2.3, x3.7, x4.8. Fits easily over regular or safety glasses. Vinyl headband has soft contoured padding and is adjustable for a comfortable fit. Dual lights on both sides with independent switches for convenience. Requires four "AAA" batteries, not included. This headstrap is not meant for in the field work, but rather to help the operator enhance their impressionging skills and learn the marks they are looking for.