Comfort and Convenience
An on-board computer is cycled manually: a wheel or stalk switch steps through readouts such as range, consumption and trip distance, and a separate press resets the counter the driver is currently viewing.
Safety and Driver Assistance
A collision avoidance system watches closing speed to the vehicle ahead continuously, without the momentary lapses of human observation, and can prime the brakes before the driver has recognised the gap is shrinking.
Multimedia and Connectivity
The audio system handles the actual sound reproduction through amplifier and speakers, while Bluetooth is only a wireless link that carries the signal to it from a paired phone.