Bargain Cable USB 2.0 External 7.1ch Virtual Sound Card Adapter for PC/Mac OS/Linux, Pack of 2 Compact, portable, and convenient to carry USB 2.0 sound card with 3.5mm input (mic) and 3.5mm output (headphone/speakers) Two Function keys: Microphone-Mute / Speaker-Mute Two Volume keys: Volume-Up / Volume-Down Two LED status lights: Mic-Mute / Activity Connector: USB 2.0 connector; no driver needed for Windows 2000 / XP / Server 2003 / Vista, Linux, Mac OS