According to VWVortex.com review: Displayed on the middle console is a large silver button without any markings. This, it turns out, is how you start the truck. There are two ways you can accomplish this either with the traditional insert key in dash method or by depressing fully on the brake pedal and pressing the silver button without the key. A sensor in the ceiling panel detects whether a key is present inside the vehicle and if that key matches the correct security code. If everything checks out, the starter button can be used to start the vehicle without the need to insert the key into the dash.