Lenovo ThinkPad Pen Pro (4X80H34887). At a size of 9.5mm, the Lenovo ThinkPad Pen Pro provides users with the same shape and feel of an 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.