Pyle Home PHPNC85 High-Fidelity Noise-Canceling Headphones with Carrying Case Reduces Ambient Noise By 97% - Larger 40mm Driver With Clear Sound And Well Defined Bass - Noise Reduced Over Frequencies 70 - 1200 Hz - Sensitivity: (dB): 102/mw Up to 20dB of Noise Cancellation - Headphone Driver Unit: Open Air - 2 X AAA Batteries Required - 30mm Dynamic Closed Type Convenient Foldable Swivel Design - Frequency Response: 30 - 20000 Hz - Cable Length: Detachable 1.0m Ergonomic Design for Maximum Comfort - Speaker Type: 40mm Mylar - 1/8'' Stereo Mini Plug Compatibility - 33 Ohms @ 1K Accessories Included Effectively Reduces Aircraft or Subway Engine Noise - Cone Impedance: 32ohm - Connects With 3.5mm Stereo Jack - Detachable Audio Cable, 1/4-Inch Stereo-Plug Adapter, Dual-Plug Adapter (for airplane use) and Hard Carry Case