Top Quality Multimedia Mini Speaker System 2.0 Channel - Powered by USB 2.0 and 3.5mm Jack for Sound Output - Black Please Note: Need Audio output you can connect USB 2.0 to Laptop/Desktop for power and 3.5mm Jack port for sound. USB 2.0 Mini Speaker Laptop/Desktop Speaker. Power: USB 5V Output: RMS 2.5W+2.5W, Impedance: 4 ohms-rate :45dB,S/N Ratio:65dB Isolated Speaker unit: 2W*2 USB 2.0+3.5mm Jack cable 1 Year Warranty.