HA2USBSM Microphone: Included Features: -USB 2.0 Complaint.-Exclusive Xear TM Software for reproduction of CD Sound.-Virtual Dolby 5.1 CH Effects.-Macintosh, Win 98Se, ME, 2000 and XP Compatible.-User friendly volume controls.-Replaceable foam ear pads.-Available with or without a microphone. Warranty: -One year warranty.