This is a 3D printed case for the Retro Innovations X-Pander 3 cartridge expander.
The device is not included in the price, however, you can purchase the cartridge expander here: http://store.go4retro.com/x-pander-3-slot-cartridge-port-expander/
This case design allows for full access to jumpers and dip switches, as well as all of the information regarding those settings printed on the right side of the circuit board. Recessed areas around the cartridge ports allow for insertion of standard Commodore 64 cartridges.
Available in a number of colors.