Portable A4 Tracing LED Board Light Box, Ultra-Thin Dimmable USB Cable Powered Artcraft Trace Light Pad Copy Boxes for Artists Tattoo Drawing, Sketching Tracer, Animation, X-ray ?A must-do firstly-please peel off the protection film and put a paper on the lighted pad, you will see it works great. Advantage: designed for portable: ? 1?-the working area is A4 paper size, the whole pad size is 138.5 inches. 2?- It is super thin: thickness is about 0.16 inches 3?-it is lightweight: about 300g 4?-Strong, tough, Crystal Acrylic pad is used so you don't worry about bending, dropping, water spraying. 5?-a very long (2meters) nylon braided USB cable included, so you don't worry the breaking and twisting of the cable. technical advantage: 1?-light-Touch sensible Switch: long press for stepless brightness adjustment. short press for on/off 2?- Memory Feature - it can memory the last settings of the brightness so you won't have to re-set again when you turn on the pad each time. (others' light pads may not have this future) 3?-flicker-free design: with strict current filtering and stabilizing, so it is much-improved eye-sore effect after long working. 4?-USB 5V power compatible: it is compatible with almost all the 5V USB standard socket, such as cellphone adaptor, power bank, computer or laptop USB port, etc. Package included: ? ( 1 A4 Light Pad + 4 Clips+ 1 nylon braided USB cable)