HUION H420 With a compact active area of4 x 2.23" (102 x 57mm) and lightweight, you will be able to take it anywhere to get your job or pleasure done. Draw, play OSU, sketch, edit files, input a digital signature and more. Combining 4000 LPI resolution and 2048 levels of pen pressure sensitivity, HUION H420 brings you excellent control of the thickness, transparency and color of your lines now even more responsively and naturally. Three Express Keys (close, save and back) are customizable, which makes your work simpler and more efficient. Battery Pen Carefully designed HUION special Digital Pen lets you draw and write naturally and comfortably as you would on real paper. Its buttons can be re-programmed for specific functions such as the right or left-click, just like a wireless mouse, and you can scroll documents and Web pages by simply pressing the middle button of the digital pen over the tablet working area. It can replace the mouse and fits both the left and right-handed. How to use the battery pen: Please first kindly put in a new AAA battery inside of the pen, and then press the power button before you start using it. Note: Due to different custom laws from different countries, CDs and battery for the pen might not be allowed to be included in the package. We suggest you directly download the latest driver from our site.