20 Most Recent Koss Quiet Zone QZ99 Consumer Headphones Questions & Answers

The right earphone holds the batteries. Grab the cushion and TURN it slightly and it will release from the headset. Don't pull it off without turning first.
The two AAA batteries are exposed. Just replace and replace cushion with slight turn.

Koss Quiet Zone... | Answered on Dec 13, 2011

Google (koss)(HG 911)(manual) without parens.

Koss Audio... | Answered on May 06, 2019

This could be an indication of power suply failure.

Koss Audio... | Answered on Feb 10, 2018

The player is no longer any good. Sorry.

Koss Audio... | Answered on Sep 08, 2017

A dirty lens can cause this. Clean the laser assembly.

Koss Audio... | Answered on Jan 29, 2017

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change batteries in zone headphones

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