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.
31% have it
10. 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.
74% have it
11. 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
12. Can be used wirelessly
Wireless devices allow users more freedom of movement.
15% have it
13. 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.
13% have it
14. has a battery level indicator
An indicator shows you when the device has low battery.
9% have it
15. has a 3.5mm male connector
A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.