Features: 5X/10X Magnifier: 4-inch (100mm) in diameter for 5X lens, 1-inch (25mm) embedded zoom lens for 10X magnification. LED Illumination: built in with 33pcs LED lamps, and has 3 levels of brightness for adjusting from, touch button control, perfect for brightening the items you are examining. Lithium Battery Power Supply: magnifier is operated by 1200mAh rechargeable battery, which last up to 26 hours at the lowest brightness level. Portable Handheld Magnifier: high quality that durable enough for daily use, which is a nice present for the old people or people with poor vision. Wide Applications: apply for reading books/magazines/newspapers, soldering, model building, needlepoint, sewing, coins and stamps collecting, suitable for home, office, laboratory or jewelry shop using and so forth.