While you're definitely familiar with charging through the port, you may not know that this port can also carry video and audio through it with compatible accessories. (androidheadlines.com)
Some have unique features such as tires that never go flat, car seat compatible accessories, and even dual car seat compatibility. (toptenstrollers.com)
That leaves Lightning - powered headphones and Bluetooth wireless headphones as the only compatible accessories without the need for an adapter. (theverge.com)