OCR Two Pack USB New 7.1 Channel 3.5mm Earphone Microphone Socket External Stereo Audio Sound Driveless Adapter Cable for PC Windows 98SE ME 2000 XP Server 2003 Vista Linux MacOS 10 or Higher 7.1 channel brings better stereo audio effect No driver requirement is easy for carrying and convenient use for notebook 2.0 port is compatible with most devices such as Windows 98SE/ME/2000/XP/Server 2003/Vista/Linux/MacOS Red LED indicator:Microphone Mute Status,Activity Stereo active speaker and stereo earphone