This new 4WD chassis is the same chassis we have been using for our WiFi Linux Server Robot. After many requests for selling just the chassis, we have listed it as a stand alone item. The same chassis will be used in a new WiFi Robot that will utilize the ARC32 controller and be user configurable. The current WiFi Robots (excluding the server robot) do not allow user configuration and customization. By using the ARC32 as a controller and providing the source code and a .NET application the user will be able to customize both the robot and the user interface. Look for this new WiFi Robot in the near future!