Genius SP-U115 Stereo USB Powered 2.0 Speakers with 1.5W Output and 3.5mm Audio Plug (Black) Total RMS output: 1.5 watts Total peak power: 3 watts Power supplied by USB port from desktop/notebook Selected 50x50 mm speakers for clear sound Glossy front panel Volume control Works great with any computer system using a standard 3.5mm audio plug Compatible with Win7, Vista, XP, Mac 10.0 or above