Sennheiser PXC 300 active noise-cancelling headphones are a great value and features brand new noise-cancelling technology for superior sound and freedom of background noise. Sennheisers slim PXC300 is a comfortable option to the DJ style headgear that is clunky and heavy. This product eliminates the "hiss" or "buzz" often associated with other sound-blocking models, while performing up to the standards of the most hard-core music buffs. These headphones reduce noise up to 80% and is far less susceptible to interference from cell phones and other radio-frequency sources---all thanks to improved noise-cancelling circuitry of NoiseGard Advanced technology. How it works: NoiseGard Advanced circuitry built into the earpieces monitors noise, then feeds a mirror-image, out-of-phase version of that noise signal into the diaphrams. Not only will it cancel out noises from airplanes, buses, and trains, but also helps with more subtle background sounds. The result is you enjoy your portable electronic device at lower volume levels (less battery use of Satellite/MP3 unit) with greater clarity and recognition, while protecting your ears from potential damage. NoiseGard Advanced circuitry is kind to batteries, too. One pair of AAA batteries will provide up to 80 hours of noise canceling. Design The flip and fold design enables users to rotate ear cups 90-degrees and fold them down to shirt pocket size. The headphones can lock in either an open or closed position for even more convenience. A rugged transport case is provided to protect your device. Lightweight The PXC300 has an ultra-lightweight design with ergonomic headband, two-point suspension and soft high quality ring ear pads to provide improved passive attenuation and superb wearing comfort. These headphones produce a deep powerful bass not found in conventional portable headpones. They are a great alternative for anyone on-the-go and looking for a perfect compliment to their Satellite Radio Receiver. Package Details: Includes: • Headphones • Carry Pouch Product Features: • Closed, supra-aural stereo mini headphones • Switchable NoiseGard Advance active noise-canceling technology • Improved noise-canceling circuitry that is less susceptible to interference from cell phones and other radio-frequency sources • Comfortable and extremely lightweight • Two AAA batteries provide up to 80 hours of noise canceling • Even with depleted batteries, the headphones continue to function • 3.5 mm jack plug with adaptor to 1/4“ (6.3 mm) stereo and 3.5 mm double mono • Compact, foldable design • Carrying pouch and airline jack adapters included • Cord Length: 5.9ft OFC copper cable, dual-sided Technical Specifications: Model #: PXC300 Manufacturer: Sennheiser Shipping Weight: 3 lbs. Available Documentation: In order to view our radio hardware manuals online, youll need to have Adobes Acrobat Reader installed on your computer. If you dont yet have Acrobat Reader, please visit Adobes web site to download the reader free of charge. PXC300 Sennheiser User Guide (n/a)