Sennheiser CX 275s vs Sony MDR-XB50AP

Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.

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Allows you to change ear pads without buying new ones.

The device comes with its own special case or pouch, which is useful for safe transportation.

The in-ear device is ultracompact and lightweight, with little or no interference with earrings, spectacles, hats, or hairstyles. It is inserted in the ear canal itself and blocks out a lot of environmental noise. It has stronger bass tones and is unlikely to fall out of the ear.

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.

The lowest frequency at which the device produces audio. The lower the low-frequency response, the stronger and juicier the bass.

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The highest frequency at which device produces audio. The higher the high-frequency response, the clearer and crispier the treble.

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Devices with a higher sound pressure level are generally louder when supplied with any given audio source.

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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.

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Devices with neodymium magnets are lighter and more powerful than those which use ferrite magnets. They also have more bass and clear high notes.

Wireless devices allow users more freedom of movement.

For example

A standard 3.5mm male connector is suitable for use with all MP3 players and computer sound cards.

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.

More microphones result in better sound quality and enable the device to filter out background noise.

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There is a control panel on the cable, so you can easily operate the device without having to interact with it.