For a list of all currently documented Inprocomm chipsets with specifications, see Inprocomm.
Maxim not currently documented.
"WM1270 Rev.X1" and "KL8110012000" is silkscreened on the board in the FCC photos.
"WM1270 Rev :AC" and "KL811002120A0" is silkscreened on the below board.
This device is presumed to use MAX2825.