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.
15% 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. Bluetooth version
B&O Beoplay E8: 4.2
18. has a 3.5mm male connector
A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.
86% have it
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.
22% have it
20. has a rechargeable battery
The battery can be recharged and used over again.
10% have it
21. longer battery life
The device's battery life (when in use) as given by the manufacturer. With a longer battery life you have to charge the device less often.
Sony WH-1000XM2: 38h
22. warranty period
When covered under the manufacturer’s warranty it is possible to get a replacement in the case of a malfunction.
Beyerdynamic T1 (2016): 5
23. charge time
The time it takes to fully charge the battery.
Beats X: 0.75h
24. has an open-back design
The device is designed in a way that allows sound to go out through the back of the ear cups, which usually have vents or perforations. This design provides very natural and accurate sound.