Huion A2 Large Tracing Light Box, AC Powered Light Pad, Adjustable Brightness (20.47" X 12.6") Huge Work Surface 12.6-by-20.5 inch, the LARGEST light box Huion offers, never feel restricted by space again, ensures greater productivity Brightness 548.8 cd/ m2, Illuminate Uniformity 83.2%; The evenly illuminated surface of the A2 light box gives you a clearer visual experience for tracing A/C Powered. Connects with a 6.56 feet power plug directly from the wall outlet, ensures you have a more stable lighting that is bright and flicker free Adjustable light intensity and smart brightness memorization allows you to control the light freely and effectively; Gradual light changing, NOT in steps like low, medium, and high, simply a better way to find your ideal lighting Emits very little heat, perfect for long hour working; High quality, energy effective LED lamps can last for up to 50,000 hours of use; One year warranty