Packing the one-two punch of passive and active noise reduction (ANR), the Koss Quiet Zone QZ PRO headphones are the noise cancelling headphones of choice for music lovers. Their comfort and collapsibility – not to mention sound quality – make them a favorite among travelers.For passive noise reduction, the QZPRO feature soft leatherette, closed cushions, which create a tight seal around the ear and reduce ambient noise, all while retaining bass frequencies. Active noise cancellation circuitry – embedded into each QZPRO ear cup – uses tiny microphones that sample surrounding noise and transmit that information to a processing circuit, which then generates "anti-waves" to counteract the unwanted noise and create a peaceful listening environment. No need for noise cancellation? No problem. Turn it off with the flick of a switch.Not only do the Koss QZPRO excel at noise cancellation and reduction, they deliver uncannily high quality sound. The dynamic element bears a full frequency response of 40-20,000 Hz, allowing these noise cancelling headphones to boast deep bass and balanced midrange. Because for Koss, performance is more than a priority. It’s our legacy. 40-20,000 Hz frequency response offers a full range of deep bass and treble clarity for ultimate sound quality and reproduction Soft vinyl closed ear cushions create a tight seal around ears and reduce ambient noise Active noise reduction technology eliminates unwanted low-frequency noise, creating a peaceful listening environment Fully-collapsible design makes headphones perfect for travel Extra-soft, padded headband delivers lightweight comfort for extended listening sessions Approximately 30 hours of continuous play Includes a 4 foot, single-entry straight cord and two-prong airline adapter Covered under the Koss Stereophones Limited Lifetime Warranty
