MSI MP54G3 (MS-6855A)

Overview
"P05-6855A100" is silkscreened on the board in the FCC photos.

This device is presumed to use RF2959.
 * SiGe PA on the board

Per the FCC manual's specifications, the transmitter output of this device is up to 15dBm.

Likely 00:0C:76 (MSI) OUI (on MAC address in FCC photos)