The S-Pen Pro is the Bluetooth-enabled S-Pen, which means that it does need to charge. Thankfully, everything that it is supported with has a silo for it in the device, or has a case that you can buy for it to work properly and charge.  It’s good to see that this is available, but not required. As some people might want a particular device, but don’t want the S-Pen and may end up losing it. Which is going to be more of a hassle than anything. 

These devices are compatible with S-Pen Pro

These are all of the devices that are currently compatible with the S-Pen Pro. 

Galaxy Z Fold 3Galaxy S21 UltraGalaxy Note SeriesGalaxy Tab S7 FEGalaxy Tab S7/S7 PlusGalaxy Tab S6 LiteGalaxy Tab S6Galaxy Tab S4Galaxy Tab S3Galaxy Tab Active ProGalaxy Tab Active3Galaxy Tab Active 2Galaxy Tab ActiveGalaxy Tab A 8.0 2019 with S PenGalaxy Tab Tab A 10.1 2016 with S PenGalaxy Tab A 9.7 with S PenGalaxy Tab A 8.0 2015 with S penGalaxy Note Pro 12.2Galaxy Note 8.0Galaxy Note 10.1 2012/2014Galaxy Book Pro 360Galaxy Book Flex2Galaxy Book Flex S PenGalaxy Book Flex 5GGalaxy Book Flex a S PenGalaxy Book 10.6Galaxy Book 12.0Chromebook Plus V2Chromebook ProNotebook 7 SpinNotebook S51 PenNotebook 9 PenNotebook 9 Pro

Those are all of the devices from Samsung that work with the S-Pen Pro. Mostly tablets and laptops, which Samsung has been adding S-Pen support to for years.