Some of the few pieces of hardware in the dashboard are small twin scroll wheels on the steering wheel. They are elegant, useful, and multi-functional, providing such functions as turning audio volume up and down with your thumb, adjusting cruise control speed, or clicking right or left to affect which side mirror can be adjusted. These buttons are masterful examples of industrial design both in terms of how they feel and their potential to control driving functions the same way computer users wield a scrolling, clickable mouse.