Simplecom UM228 Portable USB Stereo Soundbar Speaker offers excellent sound quality with single USB cable for both audio signal and power. Equipped with dual 4W high-sensitive magnetic drivers for left and right channels, plus one passive radiator for bass booster, to ensure louder volume, greater dynamic range, richer bass and lower distortion. No need extra 3.5mm audio cable and no need external power, this is a true single cable USB speaker with built-in audio decoder, one USB cable for both audio signal and power. Single cable helps to avoid messy wires, also save and tidy your desktop space. Laptop computers are well known for weak sound quality. UM228 is specially designed to upgrade sound quality for laptop computers, compact but powerful, simply plug one USB cable to your laptop and enjoy improved sound quality instantly. Additionally, portable size and single cable design let you easily bring it with your laptop and enjoy music anywhere. Specification : Interface: USB 2.0, USB Cable Length: 116CM, Speaker Power: 8W (4Wx2), Speaker Diameter: 40mm x2 (Left, Right), Passive Radiator: 40x70mm x1 (Center), Frequency Response: 100Hz20KHz, Operation Voltage: 5V, Impedance: 4K, Dimension: 18.2cm x 4.5cm x 5.5cm (LxWxH), Weight: 253g, Operating Systems: Windows 7 and above, macOS 10.8 and above, Chrome OS.