Built-in Dual 3W High-Excursion Drivers and Passive Radiator that allow for louder sound, greater dynamic range, improved bass, and lower distortion. Note: There is no physical volume control on the speaker. But you can easily adjust the speaker volume on your computer. One Cable for Both Audio & Power. No need for 3.5mm AUX jack, the single USB cable can feed both audio and electrical power for the USB computer speaker. Greatly help you avoid messy cable.