Eyesight-protected Technology - Ease your eye strain together with the protective film and eye-protective LED lamp; Only 5.1mm of thickness; Brightness: 1100 Lux; Illuminate Uniformity 745 cd/ m2. Stepless Adjustable Brightness - Adjust the light freely with the touch sensitive button, simply a better way to find your ideal lighting; It will remember your favorable brightness last time of use. USB POWERED - Comes with a USB cable, easily power your Huion L4S light pad from any Computer, Power Bank or USB Plug that connects directly into a wall outlet. PORTABLE - Ultra Thin Design; Sleek design with a 17-by-13 inch work surface, light weight, only 0.75kg, portable carrying in a bag on the go or on a trip. Wide Usage - Viewing Artwork Tracing Calligraphy Scrapbooking, Tattoo Transferring, Sewing Projects, X-ray Film Viewing and more;