More microphones result in better sound quality and enable the device to filter out background noise.
Nokia BH-905i: 10
3. can be used as a headset
A headset is one headphone or pair with a built-in microphone. Headsets can be used for applications which require communication i.e. Skype, games with voice chat, mobile phones etc.
96% have it
4. has an earbud form
The earbud form is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. For some people it is more comfortable than in-ear form.
11% have it
5. has active noise canceling/noise reduction
This type of device allows you to listen at lower volume levels, causing less ear fatigue as you don't have to crank up the volume to overcome background noise. Ideal for plane rides and morning commutes.
24% have it
6. lowest frequency
The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.
Audio-Technica ATH-CKM500i: 5Hz
7. highest frequency
The highest frequency at which device produces audio. The higher the high-frequency response, the clearer and crispier the treble.
Audio-Technica ATH-CKM500i: 25000Hz
8. Can be used wirelessly
Wireless devices allow users more freedom of movement.
69% have it
9. Bluetooth version
Samsung Level U Pro: 4.1
10. battery power
Samsung Level U Pro: 200mAh
11. 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.