Sennheiser PXC 250 II NoiseGard

The collapsible Sennheiser PXC 250 II travel headphones are equipped with NoiseGard technology to cancel outside noise, further enhanced by a closed design with passive noise reduction. The spruced up system now requires only one AAA battery to deliver up to 50 hours of uninterrupted listening.
The Sennheiser PXC 250 II are great for traveling and outdoor activities, ideal for use with portable audio players (MP3, MD, CD...). Their foldable design means you can just fold and flip them when needed - the patented design lets you turn the ear pieces 90 degrees and fold the headphones closed, making the headphones nicely collapsible. The headphones are also locked both in the open and closed state and come with a handy travel case.
This model is ideal for traveling on the train or bus – the soft ear pads along with closed cups provide excellent passive noise cancelling (15-25 dB for frequencies over 1200 Hz). They are equally well-suited for use in aircraft and similar environments with engine noise in the background. The NoiseGard active noise cancellation system cancels frequencies under 1,000 Hz by up to 15 dB. NoiseGard function can also be used independently, without listening to music.
Key elements:

• Fold and flip - patented design lets you turn the ear pieces 90 degrees and fold the headphones closed.
• Kevlar-reinforced cable made of oxygen-free copper.
• Impedance is for use in aircraft.
• NoiseGard power supply with belt clip can be rotated up to 360 degrees.
• Duofol diaphragms with spiral grooves deliver remarkably authentic sound.
• Ultralight coils for high efficiency when using portable players.
• Detailed audio reproduction with slightly reinforced bass is suitable for all types of contemporary music.
• Patented adaptive noise-cancelling.
• Robust and durable headphones - solid steel headband with metal reinforced joints and ends; tested headband-earcup joint durability.
• Ideal for traveling on train or bus, or plane - soft ear pads with closed earcups with NoiseGard provide excellent active and passive cancelling of ambient noise.
• This function can be used independently, without listening to music.