Pyle Home PHPNC65 High-Fidelity Noise-Canceling Headphones with Carrying Case (Discontinued by Manufacturer) Reduces Ambient Noise By 97% - Larger 40mm Driver With Clear Sound and Well Defined Bass - Cone Impedance: 32Ohm - Sensitivity: (dB): 102/mw Up to 20dB of Noise Cancellation - Noise Reduced Over Frequencies 70 - 1200 Hz - 2 X AAA Batteries Required - 30mm Dynamic Closed Type Convenient Foldable Swivel Design - Headphone Driver Unit: Open Air - Cable Length: Detachable 1.0m - 30HZ - 20,000HZ Ergonomic Design for Maximum Comfort - Frequency Response: 30 - 20000 Hz - 1/8'' Stereo Mini Plug Compatibility - 33 Ohms@1K - Accessories Included: Effectively Reduces Aircraft Or Subway Engine Noise - Speaker Type: 40mm Mylar - 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