A straight plug is better when the jack is on the top or bottom of your player.
50% have it
16. number of microphones
More microphones result in better sound quality and enable the device to filter out background noise.
Parrot Zik Sport: 8
17. has a 3.5mm male connector
A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.
83% have it
18. cable length
A long cable ensures more freedom of movement.
Pioneer SE-A1000: 6m
19. 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.
23% have it
20. warranty period
When covered under the manufacturer’s warranty it is possible to get a replacement in the case of a malfunction.