Dimension(LxWxH): 479mm x 361mm x 7mm (18.86 X 14.21 X 0.27 Inch) Active Area: 310mm x 430mm (12.20 X 16.92 Inch) Brightness: 4050 Lux Work Surface: Acrylic Panels Light source: LED Working Voltage: DC12V Guide light way: light panel Scale size: Yes Net weight: 2.3 KG Adjustable Brightness Huion A3H Light Box comes with a touch switch, which maintains the adjustable brightness of the light board. Once its connected to the power, you can adjust the light by simply touching the switch till you satisfied (Automatically Dimming Design, Smartly Memorize the brightness of your last use). Super Slim Light Board With a compact and elegant light box design, Huion LED Light Tracing Pad brings Manufacturing technology to a whole new level. It is considered to be the thinnest Light Board in the field measuring only 7.33mm of thickness. Eyesight-protected Technology Huion A3H Tracing Light Box is designed for everyone whether you are an enthusiastic amateur or a professional. Eyesight-protected Technology is designed in it as we cannot care more about our users sensations. What\'s more, Super bright LED lamps provide a perfectly even illuminated surface thats perfect for scrapbooking, calligraphy, sewing, quilting, stenciling, and more. Use of Huion Light Box 1) Professional Copy in Animation, Cartoon 2) Tatoo Tracing, Craft Projects, Fabric Design 3) Photograph, Film, Slider Transferring 4) Professional Tracing in Indoor, Architecture, Design and Drawing 5) As X-ray viewer in Hospital