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.
32% have it
14. has a straight plug
A straight plug is better when the jack is on the top or bottom of your player.
54% have it
15. has stereo speakers
Devices with stereo speakers deliver sound that surrounds the user from left and right side, creating a richer sound and a better experience.
73% have it
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.
42% have it
17. Can be used wirelessly
Wireless devices allow users more freedom of movement.
14% have it
18. travel bag is included
The device comes with its own special case or pouch, which is useful for safe transportation.
65% have it
19. control panel placed on a device
There is a control panel on the device body, so you can easily access the volume control or remote without having to interact with a cable or another device it's connected to.
12% have it
20. has a battery level indicator
An indicator shows you when the device has low battery.
8% have it
21. number of microphones
More microphones result in better sound quality and enable the device to filter out background noise.