The PXC 250 is a pair of closed, dynamic, supra-aural stereo mini headphones with NoiseGard™ active noise compensation. Due to their active and passive attenuation of ambient noise, they let you enjoy music even in noisy environments. The headphones are foldable and come with a convenient belt pouch, making them an ideal travel companion. 
 
Features

• Dynamic stereo mini headphones
• Great for travel and outdoor use with mobile sources such as CD, MD or MP3 players
• 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 use in coaches, trains etc.: soft ring ear pads with improved fit and closed ear cups ensure excellent passive attenuation of ambient noise (–15 to –25 dB for frequencies above 1,200 Hz)
• 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
• Impedance optimised for use in aircraft
• In-line NoiseGard™ power supply box (2 AAA size batteries) clips to the belt and can be rotated through 360°
• For all types of modern music: detailed sound reproduction with a slight emphasis on the bass
• High-resolution sound due to Sennheiser ”Duofol” diaphragms with spiral embossing (reduces and spreads eigenforms)
• Ultra-lightweight voice coils for high efficiency with portable players
• Adaptive baffle damping (patent pending)
• Bass tube for powerful, punchy bass
• Lightweight: only 65 g without cable 
• Rugged and durable: robust steel headband with metal joints, steel-reinforced headband ends, connection to the ear cups tested for durability
• 2-year guarantee

More noise cancelling headphones at Minidisc