- Sennheiser on-the-ear collapsible active noise cancelling headphone with carrying pouch- Fold and flip: registered design allows the ear cups to be turned through 90 degrees 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- Requires 2 AAA batteries for NoiseGard operation- Cable length: 5.9 ft- Frequency response (headphones): 10 - 21-000 Hz- Jack plug: 3.5 mm stereo- Nominal impedance: 300 Ohms- Sound pressure level (SPL): 106 dB- Total harmonic distortion (THD): 0.1%SENPXC250
