At 9. 5 mm, the Lenovo Think Pad Pen Pro is similar in size and shape to an actual ink writing instrument. With up to 4096 levels of pressure sensitivity it is an ideal input solution for a precise content creation experience. Users will also enjoy easy access to integrated right and left click buttons that provide additional tools for data interaction. A USB Pen Holder is included with each pen for an easy way to store and carry the pen with you all the time. Powered by an AAAA battery, the pen is designed to provide a premium pen experience.