But I found out:

Support OTG plug-in wired network adapter, keyboard and mouse and U disk, compatible with CUBE game consoles, Bluetooth keyboards and other equipment. The rich external allows you to play anytime and anywhere freely. Moreover, it also supports both positive and negative USB Type-C charging.

And also:
Cube iWork10 Flagship Tablet Magnetic Docking Keyboard CDK05 (is extra on numerous sites)

*A little more info!