Cisco Aironet MPI350 (AIR-MPI350), U58H010
Cisco not currently documented.
For a list of all currently documented Intersil chipsets with specifications, see Intersil.
A MAC label w/ a 00:D0:59 (AMBIT Microsystems) OUI is affixed to the board in the FCC photos.
This would likely be a later revision of the AIR-MPI350 than the U58H004 card.