More microphones result in better sound quality and enable the device to filter out background noise.
Parrot Zik Sport: 8
16. has a 3.5mm male connector
A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.
Able Planet SH180GMM
80% have it
17. cable length
A long cable ensures more freedom of movement.
Pioneer SE-A1000: 6m
18. 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.