Huion LB3 Wireless Tracing Light Box - Battery Powered WIRELESS - Brightness: 856.4cd/m2; Enjoy the convenience of working anywhere you like, portable and convenient, free you from the space limitation LONG LASTING BATTERY - Can support itself for approx 5 hours when turned on with a fully charged battery; Fully charged time 1.5 hours THIN, PORTABLE - Thickness 0.31 inch; Work Surface 16 by 12 Inches; Weight 0.32 ounces LIGHT CONTROL - Gradual Light Changing with Touch Sensitivity, simply a better way to find your ideal lighting DIVERSIFIED USAGE - can be used for a wide variety of tasks including craft projects, fabric design, transferring sketches or drawings, lettering, calligraphy, sewing and more