HUION PenPro MicroSD Card Memory Graphics Drawing Pen Tablet MicroSD Memory Expansion: save your art work freely. You can get 4GB MicroSD Card with pen tablet. Also you can use a bigger SD memory Card (Max 64 GB) Ergonomic Designed Rechargeable Pen: light, easy to hold, auto-sleep to save energy 8 Express Key and 16 Function keys: you can define it as you wish Compatible with Corel Painter, CorelDraw, Photoshop, Adobe Illustrator, Macromedia Flash,Comic Studio, SAIInfinite Stratos, 3D MAX Autodesk MAYA, Pixologic ZBrush and so on Perfect for you to draw, design and play