Spec: Lens focal length: 3-5CM Battery life: 3 hours Maximum size: 110x73x15MM Weight: 105 grams Magnification: 2-32 times adjustable Brightness adjustment: 4 levels Contrast adjustment: 4 Low voltage automatic shutdown: Yes LCD screen type: TFT LCD LCD screen size: 3.5 inches Display resolution: QVGA (320x240) Display mode selection: full color grayscale egative phase high contrast OSD menu graphical interface Special function screen freeze auxiliary backlight Charger standard USB interface, input: 100V-240V, output: 5V Magnification: 2-32X (2X, 4X, 6X, 8X, 12X, 16X, 24X, 32X) Text and background color scheme: full color black on white white on black and changeable. Package content: 1 electronic visual aid? It's great for short sentences or paragraphs, but not suitable for long readings because it can only display a few words at a time. When reading a book or newspaper, place it directly on the reading material and keep moving it while reading. ? Turn on the power button and press the upper right blue button (distance button). If the backlight is on, it enters perusal mode if the backlight is off, it enters distant view mode. ? You can easily hold the magnifying glass in your hand, it is lightweight and more suitable for reading this e-reader uses an external battery and can be used for more than 4 hours an ideal auxiliary tool for reading, writing, viewing maps and books. ? Carry it with you: compact and portable. It can be easily taken to dinners and outings, the grocery store, or the pharmacy. Ideal for reading labels on prescription bottles, food heating instructions, maps, paper recipes, price tags and small print. ? When the handle is folded, the magnifying glass screen is at a vertical 80 angle, making reading more comfortable. It adopts ultra-thin appearance, zero-distance design, support handle, easy to carry, concave two-color button design, high contrast and clear touch.