1.APPLICATION RANGE: This magnifying glass is suitable for the elderly, 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. 2.THE PERFECT LENS FOR ANY TASK: The 1.2X to 2.5X magnifying lenses are ideal for reading and hands free applications like sewing and knitting, while the 3.5X lens is perfect for soldering, model building, coins, stamps, jewelry appraisal, watch and electronic repair etc. 3. SPECIFICATION OF LED HEAD MAGNIFIER: - Product Material: acrylic lenses ABS - Magnifying Glass Size: 100 50mm - Single-lens magnifications: 1.2X, 1.8X,2.5X, 3.5X - Corresponding focal length: 300-350mm (1.0X), 240-260mm (1.5X), 205-225mm (2.5X), 135-145mm (3.5X) - Battery: 2 AAA (Not included) 4.PACKAGE CONTAINS OF OUR HEADBAND MAGNIFIER: ? 1×Reading Eyeglass ? 4×Acrylic lenses Find answers in product info, Q As, reviewsCOMFORTABLE AND STYLISH-- You can put this head mount magnifier on your head like a pair of glasses.It Can adjust the head circumference arbitrarily, regardless of the elderly and children can adjust.Head circumference adjustable range 50——68cm.This headband magnifier has a very light weigh so that you would not feel any burdened or uncomfortable. ULTRA BRIGHT HEADLIGHTS--Two energy-efficient LEDs It 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 2AAA batteries(Not Included). VERSATILE--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. 4 INTERCHANGEABLE LENSES - Strengthening lenses with 4 magnifications(1.2X,1.8X,2.5X,3.5X) are included for your various needs, and well packed in a stable case for easy carry and long time storage. ADJUSTABLE HEADBAND -- The frame can be flipped to adjust the angle of the lens and the tightness of the frame upside down. The movable head magnifier lens slot can adjust the distance between your eyes and lens for different needs.