- Mute button allows users to mute the sound quickly- Continually adjustable volume control for individual volume adjustment- Active speakers for notebooks- USB connection- With operation indicator- On/off switchSystem Requirements:- Operating system: Windows 98SE/2000/ME/XP/Vista/7Technical Details:- Connection: 3.5 mm Jack Plug- System: Stereo- Loudspeaker Depth: 7 cm- Loudspeaker Height: 16 cm- Loudspeaker Width: 6 cm- Frequency Range: 200 Hz - 20000 Hz- RMS Wave: 2- Colour of Housing: Black