For a list of all currently documented Broadcom chipsets with specifications, see Broadcom.
The FCC photos show the device with a BCM4306, however, the device name implies usage of the BCM4309. The chips may be identical besides the name change.
original model FCC ID of QDS-BRCM1007, the later model uses FCC ID QDS-BRCM1015
see also Broadcom BCM94309MPC0 (FCC ID QDS-BRCM1014)