Fi Win WF18

Overview
"Fiwin" and "WF18 S4" appears to be silkscreened on the board in the FCC photos.

Specifications, per the FCC datasheet, follow...
 * RF Output Power
 * 13dBm
 * Receive Sensitivity (@ PER < 8%)
 * -81dBm @ 11Mbps (+- 3dBm)
 * -86dBm @ 5.5Mbps (max.)
 * -89dBm @ 2Mbps (max.)
 * -93dBm @ 1Mbps (max.)