Chung Nam WLG200-3A
For a list of all currently documented Intersil chipsets with specifications, see Intersil.
"EPC000281R9RD" (???) and "REV A" appears to be silkscreened on the board in the FCC photos.
The FCC photos show the device in an eMachines M5310. It may be the standard wireless module for that device.
Possible additional FCC ID of Q72WLG100
Presumed 00:05:7B (Chung Nam) based on the FCC label