https://www.cnet.com/news/samsung-galaxy-note-9s-s-pen-will-multi-task-thanks-to-bluetooth/

The  Samsung Galaxy Note 9's stylus will be ready for action.

An FCC filing on Tuesday confirmed that the S Pen will add Bluetooth support, creating the potential of vastly expanding the accessory's functions and of distinguishing the Note 9 from rival Apple iPhones. Droid Life first reported the FCC filing and matched up the S Pen and Note 9 model numbers.