XP-Pen 18" A4 Size LED Tracing Light Table Light Box Light Pad X-ray Light Pad with Paper Clips and Anti-fouling Glove(USB Power) TheLatestConstantCurrentTechnologywithnoheatgenerationprovidesacomfortableconstantworking temperatureandanextendedLEDlifespan. Working Temperature below 30 Adjustable screen brightness and smart memorize. Simply hold your pressing to the button till you get the ideal brightness (from Bright to Dark); Smart memorize the brightness of your last useWITHOUTneedingpower. Advanced astigmatism film as well as light transmittance material guarantees high Illuminate Uniformity above 90%; more advanced LED cold light source and gentle light carefully protect your eyes. Good strengthened material of the panel, scratch-resistant. USBPowered:comeswithaUSBcable & USB Charger.ItcanbepoweredbyconnectingtheUSBcablewithaComputer/PowerBankorUSBchargerthatconnectsdirectlyintoawalloutlet. Compact and elegant design: portable, 7mm Thickness, 18 Diagonally Length, 12.4 x 8.6 Working Surface easily fits an A4 sheet.