UFi UCube Portable Compact USB Digital Speakers (Red) At just three-inches square they're personal and portable, ideal for home, on your desk or on the go! Ultra-efficient Digital Signal Processing (DSP) Amplifier. Wideband BMR (Balanced Mode Radiator) Driver 30W (2 x 15 Watts RMS) Equivalent Power Output Extremely wide listening angles up to 170 degrees Digital input via computer USB port. Powered via USB port