Logitech LS21. RMS rated power: 7W, Peak Music Power Output (PMPO): 14W, Total Harmonic Distortion (THD): 10%. Connectivity technology: Wired, Headphone connectivity: 3.5 mm. Dimensions (WxDxH): 190 x 140 x 178 mm, Audio output channels: 2.1, Subwoofer RMS power: 4W