Features 1、Ultra-lightweight, scratch-resistant hardened binoculars, with a long service life 2、5 interchangeable lens boards with different magnifications to improve applicability 3、2 bright led lights provide enough light in any situation, and can be used in dim environments 4、The headband can be adjusted according to the user experience, easy to use 5、Used for low vision reading, used in dentistry, surgery, research, used in convenient hand‑made, sewing, etc. Specification Item Type: Head-Mounted Magnifier Material: ABS+acrylic optical lens+metal accessories Model: 9892B2C charging Product Size: Approx. 215 x 125 x 145mm / 8.5 x 4.9 x 5.7in Product Magnification: 1 times, 1.5 times, 2 times, 2.5 times, 3.5 times Lens Focal Length: 500mm, 330mm, 250mm, 200mm, 140mm Size: Approx. 500mm / 19.7in 330mm / 13in 250mm / 9.8in 200mm / 7.9in 140mm / 5.5in Lens Size: Approx. 95 x 33mm / 3.7 x 1.3in Lighting Source: 2 LED lights Power Parameters: 5V, 0.1W, micro-USB Battery Parameters: 300mAh rechargeable lithium battery Package List 1 x Magnifying Glass Bracket 1 x USB Cable 1 x Wipe Cloth 1 x Yellow Cloth 1 x Head Rope 1 x User Manual 5 x Lens