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Home/Studio-style closed, over-ear noise-canceling headphones that come with carrying case and detachable connecting cord.

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About

The Koss QZ900 are closed, home/studio-style noise-canceling headphones that sit over the ears. These headphones can be used with the noise-canceling feature turned on or off, and have a 48-inch detachable audio cord with a stereo mini-plug and an integrated volume control. The QZ900 comes with a detachable 48-inch long audio cord and a carrying case, and is covered by a limited lifetime warranty.

Connections

Plug type Plug type The type of connection at the end of the audio cord, which will be plugged into the source component. Most have 1/8-inch standard (3-contact) "mini" jacks that fit portable devices. Models intended for use with newer iPod, iPhone, and some Blackberry smartphones, that have integrated microphones, audio player controls, and call connect/disconnect controls use a 1/8-inch 4-conductor mini jack. The audio function of models with 4-conductor mini jacks may not work properly or consistently with non-iPod/iPhone devices.
Mini (1/8")

Features

Works with noise reduction off Works with noise reduction off Will operate without the noise-canceling circuitry activated; allows the model to be used as standard headphones if the batteries die.
Yes
Integrated microphone Integrated microphone Has an integrated microphone for use with some cell phones or audio players with a recorder function.
No
Call connect/disconnect control Call connect/disconnect control This allows you to answer or disconnect from a phone call with some cell phones.
No
Integrated volume control Integrated volume control This allows you to adjust the volume without having to dig into your pocket or purse for a player.
No
Integrated player control Integrated player control This allows you to control some player functions (for example: play, pause, track skip) via a control without having to dig into a pocket or purse for a player.
Yes
Detachable cable Detachable cable A detachable cable allows the headphones to be used for noise canceling without the cord being connected to a music or video player, or dangling from the headset.
Yes
Monitor function (mute) Monitor function Has a control that turns off the audio, and in the case of noise canceling models turns off the noise canceling function, so that ambient sounds can be heard. Useful for hearing ambience like travel announcements without turning off the audio player or removing the headphones.
No
Noise canceling unit in earpiece Noise canceling unit in earpiece The electronic circuitry for the noise cancelation function is integrated into headphones earpiece rather than incorporated as a separate module that is integrated into the audio cord.
Yes
Battery life (hrs.) Battery life As claimed by the manufacturer.
50
Battery recharge time (hrs.) Battery recharge time As claimed by the manufacturer.
N/A
Low battery indicator Low battery indicator An indicator to show that the headphone battery power is low and will need to be replaced or recharged.
No
Warranty (mos.): parts/labor Warranty (mos.): parts/labor Warranty is for parts and labor, in months.
Limited lifetime
Additional features Additional features Additional features for this model.
None
Included accessories Included accessories Indicates what accessories are included.
Caring case, detachable 48-inch long connecting cord.

Specs

Weight (oz.) Weight Reflects the weight, in ounces, of the headphones including the audio cable and batteries, if any.
8
Cable length (in.) Cable length Cable length indicates the approximate length of the cable from the headset or earpiece to the plug, measured in inches.
48
Battery type Battery type The number and type of batteries used.
(1) AAA

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