USB-Powered Hotmai HN-88 Compact Portable Multimedia Device 2.0 Aux Wired Speaker, 35mm: Transportable Speaker Music that is portable and has high-quality sound 2.0 USB connection technique: Frequency response range for 3.5mm audio jack: 100Hz–20KHz Additionally, the speaker is compatible with TVs, PCs, and mobile phones via a 3.5mm to 2RCA line.