Lenovo ThinkBook Yoga Integrated Smart Pen stylus pen 4 g Grey The ThinkBook Yoga integrated smart pen, with up to 4096 levels of pressure sensitivity, provides a natural pencil-and-paper-like experience when you sketch and jot down notes. Users will also enjoy easy access to short-cut functions through two built-in customisable buttons on the base of the pen. This pen can also be conveniently stored and charged in the notebook’s pen slot.