these are the parts you received with this robot :
This is the main board with the arduino Uno board on the top (this is a proprietary board not available separately) :
This is the Wifi server (based on a linux kernel) :
This is the Silicon Labs CP210x USB to UART Bridge :
Reference : http://www.silabs.com/products/interface/usb-bridges/classic-usb-bridges/Pages/usb-to-uart-bridge.aspx