Genuine OEM Audi Ignition Start Stop Button, part number 83A905217A. This essential electrical switch allows the driver to conveniently start and stop the vehicle's engine with a single press. It is typically located on the dashboard or center console, providing direct control over the ignition system. The button features a clear 'START ENGINE STOP' label and a distinctive red ring accent, measuring approximately 0.055 meters in length and weighing 0.026 kg. Choosing a genuine OEM ignition button ensures precise electrical signaling, durable tactile feedback, and seamless integration with the vehicle's complex electronic control units for reliable operation.