Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.
41% have it
3. has an in-line control panel
There is a control panel on the cable, so you can easily operate the device without having to interact with it.
38% have it
4. no battery needed
This device works without batteries. It weighs less and you don't have to worry about recharging or replacing the battery.
28% have it
5. 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
6. has a 3.5mm male connector
A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.
32% have it
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. driver unit size
The driver unit is the component that produces sound in the device. Bigger drivers are more powerful and can produce better bass.
Plantronics .Audio 355: 40mm
9. sound pressure level
Devices with a higher sound pressure level are generally louder when supplied with any given audio source.
Sennheiser Presence UC: 118dB/mW
10. lowest frequency mic
The lowest frequencies that the mic can pick up well. Better for recording bass. If a microphone is going to be used for speech, a voice microphone, it must have great gain for bass, since human voice is in the low frequencies.
Sennheiser Presence UC: 6.8Hz
11. cable length
A long cable ensures more freedom of movement.
Nokia BH-905i: 2.9m
Impedance is the device’s electrical resistance to the current being pushed through it. The lower the impedance, the easier it is to get higher volume and requires less power.
Beyerdynamic MMX 101 iE: 12 Ohms
13. has an L-shaped plug
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.