Dragonwar Professional Gaming Speaker with Expanded Bass and Optimized Digital Amplification Build in 3D game mode sound card decoder with Touch Screen Control Expanded Bass Resonance Chamber and Nexphil clear and anti-noise technology 360 Omni-directional sound and gold plated USB connector (USB 2.0/1.1) Win 7 ready, Window Vista, Mac OS Output power 4.8W + 4.8W (THD=10%. f=1KHz)