WiFiTrax has 2. One is a module that plugs in to the cab bus, that's the first one they came out with, the WFD-30
WifiTrax - WFD-30
They now have a new one, the WFD-31, which replaces the PCB of any cab bus panel OR PowerCab Panel - it does what the PowerCab Panel does for the PowerCab PLUS adds a WiFi interface.
WifiTrax - WFD-31
--Randy