The Phanteks Mini XL ITX Upgrade Kit allows users to install a second complete system in the Enthoo Mini XL chassis. The kit includes a read I/O panel to support 2 PCI-e slots and 1 SFX power supply, a mini ITX motherboard mounting tray, and one 5.25in Front Panel I/O device that includes 2x USB 3.0 ports, a headphone, microphone, power button, and reset button.