Huion 24&rsquo;&rsquo; A3 Size Lightness Adjustable Built-in Battery USB Cable LED Portable Drawing Tracing Stencil Board Tattoo Light Box with Kenting Stander,Clip,6 Pieces of Tracing Paper,Cleaning Cloth-LB3H Battery and USB mode are available. The LB3 drawing tracing pad can get powered by either built-in Battery or USB cable. After full charged, you can take it out anywhere and feel never feel restrict by the USB cable. Adjustable Brightness. You may adjust the light by simply touching the touch switch. Brightness could reach 2200 Lux Maximum(USB Mode). Its brighter than the L4S model. Extremely thin. This light board is 8 mm in thickness. With a compact, sleek and graceful design, its 1.665 KG weight is very easy to bring with. Gets very little heat. Suitable for long hour working. Life time 50,000 hours' long. LB3 light boxs LED cold light source protect your eyes carefully, providing the most comfortable lighting environment for animators, designers, engineer, tattooist, doctor, art enthusiasts.