Ergonomic construction gives it a good balance and a comfortable grip, make you feel not too heavy or too light. ? APPLICATION RANGE: ? The aged, low vision crowd, macular degeneration, reading books, newspaper, read crossword puzzles,suitable for children to observe insects,repairing electronics, cataloguing coins, help produce small,precise handicraft workers,appreciating flowers potted landscapes etc. ? THE PERFECT LENS FOR ANY TASK: ? The 2.0X to 5.5X magnifying lenses are ideal for reading and hands free applications like sewing and knitting, soldering, model building, coins, stamps, jewelry appraisal, watch and electronic repair etc. ? SPECIFICATION OF LED HEAD MAGNIFIER: ? Magnification: 2.0X,3.8X,4.5X,5.5X ? Power: 3 x LR1130 coin batteries Clear graphics: passed precise optical test, excellent tool reading and natural exploration, with various functions such as anti-scratch and anti-glare, providing a rich reading experience? The LEDs is quite bright and makes good light to ensure accurate irradiation of light source on the surface of viewed object ,making it more convenient in use.This magnifying glass lamp can be used as a headlamp at night. No worries about light condition anytime and anywhere.Powered by 3x LR1130 batteries. ? The individual lenses magnifying lenses can be easily assembled and dismantled.Perfect headset magnifier for close up work like dentists,electricians,jewelers,sewing,crafts,beauty,painting and the elderly. ? Head band is adjustable.Ergonomic frame design. This headband magnifier glasses has a very light weigh so that you would not feel any burdened or uncomfortable. ? 5 interconvertible lensmagnifications(2.0X,3.8X,4.5X,5.5X) are included for your various needs, and well packed in a stable case for easy carry and long time storage. Wide range of uses: You can use a portable magnifier to read books, insects, plants, jewelry, crafts, children's hobby observation, etc.