This report was reported by FCC filing which has confirmed that
Note 9 [comparebox.pk]
S Pen [comparebox.pk] will have Bluetooth functionality in some way. However, Samsung fans across the globe have speculated that Samsung might be using it as a multi-purpose Bluetooth button. If this is true, the button will allow the users to do things like control music, take photos, answer calls or start and stop camera timers. There is also another possibility that Samsung may be giving Bluetooth equipped S pen stylus features like Tile-esque location option for tracking the pen in case the user loses it or use the stylus to find the pen by triggering an alert or make some noise.