The driver unit is the component that produces sound in the device. Bigger drivers are more powerful and can produce better bass.
Audeze LCD2 Classic: 106mm
16. has an over-the-ear form
Comfortable full-size form with earcups that fully enclose your ears. This model is loved for its increased sound isolation and the fact that it won't leak sound to your neighbors. It offers potential for maximum bass and loudness levels.
41% have it
17. travel bag is included
The device comes with its own special case or pouch, which is useful for safe transportation.
63% have it
18. has a straight plug
A straight plug is better when the jack is on the top or bottom of your player.
51% have it
19. number of microphones
More microphones result in better sound quality and enable the device to filter out background noise.
Parrot Zik Sport: 8
20. has a 3.5mm male connector
A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.
85% have it
21. 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.