The PXC 250 is a closed, dynamic, supra-aural mini stereo headphone that serves as an ideal travel companion. The exclusive NoiseGard active noise compensation system reduces nearly 80% of ambient noise, allowing you to listen to music in peace. The headphones collapse easily to fit inside a pocket or for convenient storage in the included belt pouch. Package Details: Includes: • PXC250 Headphones • Carry Case Product Features: • Dynamic stereo mini headphones • Fold and flip: registered design allows the ear cups to be turned through 90° and fold the headphones closed (headphones will lock in open and closed positions) • For transport: supplied with soft belt pouch with extra pocket (185 x 105 x 40 mm) • 1.8 m Kevlar-reinforced OFC copper cable with 3.5 mm jack plug, delivered with an adaptor to 6.3 mm • (1/4") stereo and 3.5 mm double mono (for airline audio) • Ideal for aircraft and other environments with engine noise: the switchable NoiseGard active noise compensation attenuates frequencies below 1,000 Hz by up to -15 dB • High-resolution sound due to Sennheiser "Duofol" diaphragms with spiral embossing • Bass tube for powerful, punchy bass • Lightweight: only 65 g without cable • Requires (2) AAA batteries for NoiseGard operation Technical Specifications: Model #: PXC250 Manufacturer: Sennheiser Weight: 3 lbs. Available Documentation: In order to view our radio hardware manuals online, you will need to have the Adobe Acrobat Reader installed on your computer. If you do not have Acrobat Reader, please visit the Adobe web site to download the reader free of charge. PXC250 User Guide