Comfort and Convenience
The listed start-stop system reads the brake pedal: holding the car stationary cuts the engine, and lifting off the pedal or touching the accelerator restarts it, so idling stops without the driver switching anything.
Safety and Driver Assistance
Hill start assist only holds the brakes briefly while the driver moves between pedals on a slope. It does nothing once rolling, so following distance still depends on the gap needed for braking to work.
Multimedia and Connectivity
The listed audio system handles amplification and speaker output, while the separate USB connection carries data from a device. One decides how sound is reproduced; the other determines where that sound comes from.