Logitech Multimedia Speakers Z213. Audio output channels: 2.1 channels, RMS rated power: 7 W, Recommended usage: PC/notebook. Total Harmonic Distortion (THD): 10%. Satellite speaker mid-range driver diameter: 5.08 cm (2"), Satellite speaker dimensions (WxDxH): 79 x 76 x 142 mm. Subwoofer driver diameter (imperial): 10.2 cm (4"), Subwoofer dimensions (W x D x H): 130 x 193 x 183 mm. Power source: AC, Power plug type: Type C