Comfort and Convenience
Power mirrors move the glass by small motors worked from a switch near the driver, so the rearward view is set without reaching across. Aiming the glass is all they do; folding the housings is a separate function.
Safety and Driver Assistance
The driver's airbag sits in the steering wheel hub. In a serious frontal impact, sensors trigger inflation within milliseconds, so the chest and head meet a cushion rather than the rim, then gas vents away.
Multimedia and Connectivity
An AUX input is only a wired path for an analogue audio signal into the audio system. The connected device still chooses and plays the content, while volume and tone are handled by the head unit.