The HQ2 vibration stereophone features two elements: a vibration element for tactile movement of the headphone and a dynamic element for stereo sound reproduction. To make a virtual game come to life, the vibration element translates frequencies below 100 Hz into vibrations, creating a "moving" experience. For increased vibration when the action is at its peak, a thumb wheel control on the left earcup provides easy vibration level adjustment. An on/off switch allows the user to listen to the same high quality sound with or without the vibration. In addition to the vibration element, the HQ2 features a Mylar diaphragm and neodymium iron boron magnet structures to deliver a full range of deep bass and treble clarity for a frequency response of 20-20,000 Hz. Oxygen free copper voice coils improve signal transmission and conduction for a sound of Koss that is clean and clear. Closed, leatherette ear cushions seal around the ear maximizing isolation and impressive bass performance. Whether you're alone or online, the HQ2's sound will be so efficient that you'll hear your opponent before they even know you're there. Its large, closed ear cups surround the ear for maximum isolation so you can stay focused on saving the world or kicking a forty-yard field goal. Soft, leatherette ear cushions envelope your ears without creating pressure for long lasting comfort. Koss' Clear Voice Technology (CVT) noise canceling electrets condenser microphone eliminates excessive background noise for a greater ease of use with PC voice applications, such as speech recognition.