The U213's 2 - inch full range driver with 11-degree titled angles of the speakers give you the most relevant details of your audio track. With 2W output power need not require unnecessary buttons and controls to handle. This speaker set just has a front volume control and red LED power-indicator. Keep it simple! Made specially for those who want to boost their PC or laptop experience these speakers are USB based. Simply plug in and enjoy. These sleek black designed speakers with red ring around the driver are known for their small size and great performance.