3-level adjustable brightness allows you to have suitable luminance for better tracing performance, simply touch the ON/OFF switch to adjust. USB powered design, can be easily powered by the included USB cable from computer, power bank, power adapter, etc. Specifications: Brightness: Constant Brightness/ 3-level Adjustable Brightness/ Stepless Adjustable Brightness(Optional) Work Surface: Acrylic Panel Light Source: LED Lux: 2000-2500LUX Color Temperature: 6500K (300K) Illuminated Space: 30.5 * 21.5cm / 12 * 8.5in(H * V); 37cm / 14.6 #34;(Diagonal) Power Supply: USB DC 5V USB Cable Length: about 2 meters Item Size: 33.3 * 21.5 * 0.3cm / 13.1 * 8.5 * 0.1in Item Weight: 247g / 8.7oz Package Size: 37 * 24 * 4cm / 14.6 * 9.4 * 1.6in Package Weight: 410g / 14.5oz Package List: 1 * Copyboard 1 * USB Cable