User Manual: Google WiKi search KVM-A3 for hareware installation and software configuration guide
Extra Need to be Prepared: Raspberry Pi 4, TF Card, HDMI Cable, Power Adapter (Not included, need to prepare by yourself)
How to Power: Power
Input: 5.1V dc +/-5%, 3A; Power Via USB Type-C port of X630-A3 (DON'T power via Raspberry Pi's TYPE-C port, because it is occupied as USB OTG)
What Included: 1 x KVM-A3 Metal Case with Accessories, 1 x X630-A3 V 1.3 Expansion Board with Accessories, 1 x X630-A5 V 1.0 Adapter Board with Accessories, 1 x X630 HDMI to CSI-2 Module with Accessories, 1 x Ethernet Cable (1m length), 1 x 0.96 inch OLED Module
How to Cool: X630-A3 comes with a cooling fan to cool the Raspberry Pi 4