Enjoy an optimal listening experience in noisy environments with the Swiss Cougar Noise Reducing Headphone Blockout irritating background noise and enjoy your music in peace with this stylish headphone that actively cancel background noise by up to 85%. Smart noise canceling technology enhances the pleasure of listening to lower volume levels in noisy environments. The technology creates an equal but opposite waveform to the unwanted noise that effectively cancels it out. Specifications: On/off Switch Speaker Unit: 40mm Frequency range: 20-20KHZ Active cancellation: up to 12-18dB between 100-500Hz Power: 1.5V battery (AAA) – Not included Cord length: 1.5m Plug: 3.5mm StereoProduct Dimension: