FC-USB adds 4 USB2 ports to fitlet2 for a total of 8 ports (2x USB3 + 6x USB2, all type-A connector)
FC-USB has an M.2 key-E socket, normally used for a Wi-Fi adapter.
Notes:
- Does not affect M.2 SSD (M.2 SSD 2260 can be installed with FC-M2LAN)
Type: Narrow FACET Card
Technical documentation: http://www.fit-pc.com/wiki/index.php/Fitlet2_FACET_Cards#FC-USB
