Plantronics Audio 648 USB Noise-Cancelling Headset: * Discrete, low profile design * Skype Certified for a better chatting experience * Easy-to-use inline volume, mute and call controls * Digital Signal Processing cancels echo and boosts voice signals * 24-bit hi-fi stereo sound is digitally equalized to give enhanced HD sound * Noise-canceling microphone works with DSP to block low-frequency noise and provide crystal clear conversations * Comfortable foam ear pads and lightweight materials * Speaker Driver: 32mm * Frequency Response: 20Hz - 20kHz * 24-bit high fidelity stereo output * Cable Length: 6.5" * USB full speed compliant * Windows and Mac compatible