Sennheiser PXC 250 Active Noise Canceling Headphones

Amazon.com Product Description Portable audio takes on fresh life with quality headphones, and Sennheiser's folding, lightweight, closed-ear PXC 250 is designed to keep outside noises out and headphone sound in--perfect for use in busses and libraries alike.

Increase the peace! The PXC 250 features a noise reduction unit that cancels out background noise.

When engaged, NoiseGard active noise reduction drops steady-state low-frequency noise (from about 500 Hz and below) by 15 dB--which the human ear perceives as more than halving the noise--thus enhancing the clarity of your music. The noise reduction circuit requires 2 AAA batteries (not included), but the headphones work fine without the circuit engaged.

Sennheiser's fold and flip design lets you turn the ear pieces 90 degrees and fold the headphones closed. Their ported design lets them move more air for greater bass response.

What's in The Box
6-foot Kevlar-reinforced cord, .25-inch stereo adapter, airline adapter, belt pouch.

With all the latest advances in digital music and sound fidelity, should you be using those headphones that came with your portable MP3 or CD player? Here's a way to get the best possible sound - The Sennheiser Way. The Sennheiser PXC 250 is a closed, dynamic, supra-aural mini stereo headphone with NoiseGard active noise compensation (requires 2 AAA batteries). 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.