1.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. 2.THE PERFECT LENS FOR ANY TASK: The 1.5X, 2.5X magnifying lenses are ideal for reading and hands free applications like sewing and knitting, while the 8X 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 - Single-lens magnifications: 1.5X, 2.0X,8X - Corresponding focal length: 330mm (1.5X), 250mm (2.0X),62.5mm(8X) - Battery: 3 AAA (Not included) Find answers in product info, Q As, reviewsVERSATILE -- 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. COMFORTABLE AND STYLISH -- Head band is adjustable with just a turn of a knob to give you a comfortable fit.Ergonomic frame design. This headband magnifier has a very light weigh so that you would not feel any burdened or uncomfortable. ADJUSTABLE LED LIGHTS-- LED light can be rotated and light source box with battery compartment is detachable.Light source box can be used separately as lighting source after being dismantled.It is quite bright and makes good light. No worries about light condition anytime and anywhere.Powered by 3AA batteries(Not Included). EASY TO OPERATE -- The movable head magnifier lens slot can adjust the distance between your eyes and lens for different needs to ensure accurate irradiation of light source on the surface of viewed object ,making it more convenient in use. 3 MAGNIFYING GLASS LENSES -- An 8X auxiliary lens and 2 interconvertible lensmagnifications(1.5X,2.0X) are included for your various needs, and well packed in a stable case for easy carry and long time storage.