Usage Tips:Upgraded 30X High Magnification Magnifier: This USB magnifier offers 30x magnification with a 1200mAh rechargeable lithium battery. The continuous use time can be up to 12 hours after it is fully charged. The lens adopts a single layer of optical glass lens (not resin lens or acrylic lens). Ultra HD magnification helps the elderly and visually impaired read easily and clearly. 3 lighting modes: The built-in 21 energy-saving LED lights of the handheld magnifier are designed to provide good illumination even in poor lighting conditions and make it more convenient to use. Magnifying glass with light 3 lighting modes, you can change the lighting mode as you like to better protect the eyes, especially suitable for people with macular degeneration, farsightedness or amblyopia. One-button touch adjustment: This 30x reading magnifier conforms to the ergonomic design, comfortable, easy to use, lightweight and easy to carry, lightweight, wide magnification range. Without buttons, the sensitive touch sensor can easily switch between 3 lighting modes. No more using non-ecological AAA batteries, which can save you at least 200 per year. Perfect gift for the elderly and children: Handheld magnifier with 21 lights is suitable for the elderly to look at fine print on instructions, receipts, prescriptions, small print and medicine bottles, as well as to read books, spapers, magazines, etc. Children can observe insects, flowers and plants. The best Christmas and birthday gifts for parents and children! Note: The data is all manual measurement, please allow 1 - 3cm error, due to the difference of light and display, there will be a certain color difference, depending on the physical object received.