A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.
80% have it
16. cable length
A long cable ensures more freedom of movement.
Pioneer SE-A1000: 6m
17. has an on-ear form
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.
22% have it
18. has an earbud form
The earbud form is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. For some people it is more comfortable than in-ear form.
5% have it
19. diaphragm size
The diaphragm moves air back and forth to create sound. The bigger the diaphragm, the more bass it can produce.