Genuine OEM Audi Start Stop Ignition Button, part number 81A905217. This essential component initiates and terminates the vehicle's engine operation, providing a direct interface for the driver. It is typically located on the dashboard or center console. Weighing approximately 0.024 kg, this button features a distinctive red ring and a silver-grey center. Choosing a genuine OEM button ensures correct electrical signaling, precise tactile feedback, and seamless integration with the vehicle's complex ignition and engine management systems.