Reduce unwanted noise by more than 85 percent (up to 12dB at 300HZ), ideal for achieving peace and quiet in planes, trains, buses and cars Active noise reduction from 40 to 1, 500Hz using 1AAA battery extended battery life approximately 30 hours Unique full-size ear cup design with comfortable padding for extended wear Adjustable folding headband for compact storage and travel Sing-sided cord minimizes tangles Gold-plated 3.5mm stereo plug Technical Details Type: Over-ear, noise-cancelling, foldable, full-size ear cup Headband: Over-head, adjustable Attenuation: 12dB at 300Hz; applicable noise-reduction range: 40 to 1500Hz Impedence: 32 ohm Frequency Range: 20-20, 2000Hz Sensitivity(off/on): 113dB+/-3dB/119dB+/-3dB Max Input Power: 30mW Noise Reduction Level: 12dB at 300Hz Accessories Included Dual-Prong Airplane Adapter Travel Pouch