With the KVM module you can comfortably control servers via KVM with the GPD Pocket 3.
With the RS232 module the GPD Pocket 3 gets a real RS232 port (no USB to serial adapter) and is thus ideally suited for debugging systems or controlling professional CNC milling machines, etc..
Both modules are included in this pack.
The GPD Pocket 3 has a USB-A module built in by default. You can remove this module and install one of the two modules here.