The PXC 300 are closed, dynamic, supra-aural mini headphones with the latest active noise compensation technology (NoiseGard™ Advance). General Description Passive and active noise reduction enable you to enjoy music even in noisy environments. Ideal for travelling: the PXC 300 is supplied with a protective soft case for storage and transportation. Features Dynamic stereo mini headphones Ideal for mobile audio sources such as MP3 players or portable CD players NoiseGard™ Advance: improved circuit technology protects the headphones against interference from mobile phones etc. 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) Includes high-quality transport case with zipper Soft ring ear pads ensure good passive attenuation of ambient noise Switchable NoiseGard™ Advance active noise compensation, ideal for use on planes or in any other environment with engine noise In-line NoiseGard™ Advance box (for 2 AAA batteries) can be rotated through 360° Transparent and lifelike audio reproduction due to Sennheiser "Duofol" diaphragms with spiral embossing Computer-optimised neodymium magnets for extremely low distortion Bass tube for crisp, powerful bass Supplied complete with ¼" (6.3 mm) stereo jack adaptor and 3.5 mm double mono jack adaptor for in-flight entertainment systems Lightweight (only 65 g without cable) 2-year guarantee Technical Data Nominal impedance 300 ? Jack plug 3,5 mm stereo Transducer principle (Headphones) dynamic, closed Ear coupling supra-aural Cable length 1,8 m Weight w/o cable 65 g Frequency response (headphones) 8.....21500 Hz Sound pressure level (SPL) 107 dB (SPL) THD, total harmonic distortion 0,1 % Operating time (Battery) 80 h Delivery Includes 1 PXC 300 1 transport case 1 adaptor to ¼" (6.3 mm) stereo jack plug 1 adaptor to 3.5 mm double mono jack plug 2 AAA batteries Operating instructions