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The Hamilton Electronics HA-66USBSM starts with Hamilton's HA-66M headphone with built-in microphone and adds integrated USB Sound. Use these headphones with any USB-equipped computer. Specifications: USB 2.0 Compliant Impedance: 32 Ohms Frequency Response 20 - 20,000 Hz Speaker drivers: 40mm Mylar Headphone frequency response: 18 - 20 Hk Microphone -Electret Condenser, Omnidirectional Pickup Soft leatherette style washable ear cushions Windows 7, Vista and XP Compatible (Latest service packs recommended) Mac OSX Compatible (Latest updates recommended)