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Can I use this device on WIFI?

Yes, with an optional USB WIFI adapter and firmware version min. 3.22(2.04 with LaCinema Connect). Compatible adapters are listed below:
BrandModel
BelkinF6D4050 Ver.1
F5D8055 Ver.1 / Ver.2
BuffaloWLI-UC-G300HP
WLI-UC-GN
WLI-UC-GNHP (2009.Nov.02)
D-LinkDWA-125Ver. A1 (FW 1.00) / A2
DWA-140 Ver. 1.30
DWA-160 Ver. A1
HawkingHWUN3 (2010.Feb.25)
LinksysWUSB100
WUSB600N Ver.1 / Ver.2
NetgearWN111 Ver.2
WNDA3100-100
PlanexGW-USMicroN (2009.Nov.02)
TRENDnetTEW-645UB Ver.1.0R
ZyXELNWD270N (2009.Nov.02)
NWD271N

Other adapters may work, but have not been tested.