FC-POED allows powering fitlet2 from a POE source while providing a 3rd Gbit Ethernet port.
fitlet2 with FC-POED can be powered by 802.3af compliant PSE or later.
FC-POED occupies both M.2 sockets and provides M.2 sockets of its own:
M.2 M-key 2260 | 2280 for SATA SSD
M.2 E-key 2230 (usually used for WiFi adapter)