Rechargeable Battery Powered - This light tracing box let you enjoy the convenience of working wirelessly at anywhere you like with the built-in battery, works for approx 3.5 hours after fully charged. Battery and USB mode are both available. Ultra Thin and Portable - Thickness 8mm; Work Surface 12 by 9 Inches, fit on A4 size sheet; Weight 0.55kg. Accurate Positioning - Measure scale is attached, benefiting the accurate positioning in drawing creation. Eyesight-Protected LED Technology - High quality acrylic panel allows light to be introduced from both sides, and with dodging LGP, the light is more even and light source is more stable. Maximum Brightness - 4000 Lux. Stepless Adjustable Brightness - LITENERGY Light table is adjustable with all Levels for adapting to different environments; Gradual Light Changing with Touch Sensitivity, simply a better way to find your ideal lighting; Remember your favorite brightness, the brightness you know when you open it next time. Diversified Usage - Designed for drawing, sketching, stenciling, 2D animation, cartoon, portrait, tattoo tracing, sewing, quilting projects, fabric design, X-ray viewing, photograph, slides viewing, calligraphy, embossing, scrapbooking and much more. With USB/Lithium Battery inside powered,8mm thickness and A4 size, you can carry it anywhere and don't need to worry if there is a plug for you to charge.