Function keys: Microphone-Mute, speaker-mute, volume-up, volume-downLED indicators: Microphone-Mute Status, activityDriverless-No driver required for Windows 98SE/ME/2000/XP/Server 2003/Vista,Linux,MacOS The USB Virtual 7.1 Channel Sound Adapter is a highly flexible audio interface which can be used either with desktop or notebook systems. No drivers required, just plug and play for instant audio playback, also compatible with all major operation systems.1x7.1 CHANNEL AUDIO SOUND EXTERNAL USB 2.0 CARD