SDIO Wifi. This "no slot" SD Wifi card is made for the Mini6410 and Tiny6410 SDK. It fits a 20 pin header called SDIO2 and is not for use on other boards (unless you design your own).
USI WM-G-MR-09 (Marvell 8686)
IEEE 802.11b/g
WEP 64/128
SDIO 1bit/4bit
LED indicator
170 mA Rx, 265 mA Tx, 600 uA idle