As you may have a software that gives voice guidance, we have optionals 12V 25W Speaker that can be installed and are wirelessly connected (through Bluetooth).
It is powered with our central 12VDC power supply unit, so that when you buy the complete K12, you don’t to search for this specifically.
Our default factory settings are good for most cases. If you need to increase even more the volume, select the switch as below showed
In any case, the volume is controlled through the Tablet volume.