The driver unit is the component that produces sound in the device. Bigger drivers are more powerful and can produce better bass.
2.Has an L-shaped plug
vs No (68% don't have it)
An L-shaped plug is better if the jack is on the left or right side of the device, so that the cable isn't bent, and is less likely to break when the device is in your pocket.
3.Has an on-ear form
vs No (78% don't have it)
This device comfortably rests on top of your outer ears. As it doesn't block out everything from the outside world, it's preferred in places like office environments and recommended for outdoor activities.