https://insights.samsung.com/2025/01/24/how-to-boost-productivity-with-the-s-pen-on-your-galaxy-s25-ultra/
The Bluetooth-enabled S Pen (now sold separately) acts as a remote control within select apps to help maximize productivity.
S Pen is embedded in Galaxy S25 Ultra as a new secret weapon for your work. Bluetooth-enabled S Pens are sold separately.