- Power is conveniently supplied via the USB connection- Continually adjustable volume control for individual volume adjustment- Active speakers for notebooksTechnical Details:- Connection: 3.5 mm Jack Plug- System: Stereo- Loudspeaker Depth: 7 cm- Loudspeaker Height: 7 cm- Loudspeaker Width: 7 cm- Frequency Range: 32 Hz - 20 kHz- Impedance: 4 ?- RMS Wave: 2x 25 W- Sine Wave Loudspeaker: 036 W- Total Harmonic Distortion Speaker >: 3 %- Colour of Housing: Black