Stereo USB Powered Speakersn- Power supplied by USB port from desktop/notebook;n- Selected 50x50 mm speakers for clear sound;n- Glossy front panel;n- Volume control;n- Works great with any computer system using a standard 3.5mm audio plug;n- Compatible with Win7, Vista, XP, Mac 10.0 or above.nnDon’t be limited by a power adapter, Genius releases cute mini speakers, SP-U115, whose power is supplied through a USB port from a desktop/notebook. They use 50mm speaker drivers for loud and clear sound performance for a total of 1.5 watts RMS. Four glossy front covers to choose from: shiny black, sapphire blue, ruby red, or grass white. It has a convenient knob on the side to adjust the volume. Just insert the USB plug to a PC/notebook for power and the 3.5mm audio plug into music playback device, such as a PC, notebook, MP3 or CD player and enjoy music with the SP-U115.