Sennheiser HD 4.40 BT review: specs and price

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

With a detachable cable you can use alternative cables, and if the cable is pulled it will pop out instead of breaking.

Comfortable full-size form with earcups that fully enclose your ears. This model is loved for its increased sound isolation and the fact that it won't leak sound to your neighbors. It offers potential for maximum bass and loudness levels.

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Folding devices are good for transporting as they take up less space in your bag.

The cable is designed to minimize tangling.

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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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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 device sits tightly in place, creating an acoustic seal which reduces background noise and prevents your music from leaking out.

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.

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.

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An indicator shows you when the device has low battery.

The battery can be recharged and used over again.

The time it takes to fully charge the battery.

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The battery is removable and can be replaced by the user if broken.

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Wireless devices allow users more freedom of movement.

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The device can connect at a greater distance via Bluetooth or infrared to another device.

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

Device supports fast Bluetooth pairing using NFC so it can communicate with other devices over Bluetooth. You can fastly pair devices without entering a code by simply holding one device next to the device with which it is to be paired.

The device can connect to WiFi.

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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.

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.

When covered under the manufacturer’s warranty it is possible to get a replacement in the case of a malfunction.

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

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These microphones are designed to filter out background noise from the desired sound. Especially useful in noisy environments.

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