Logitech Multimedia Speakers Z333. Audio output channels: 2.1 channels, RMS rated power: 40 W, Recommended usage: Universal. Satellite speakers RMS power: 8 W, Satellite speaker mid-range driver diameter: 7.62 cm (3"), Satellite speaker dimensions (WxDxH): 108 x 90 x 180 mm. Subwoofer RMS power: 24 W, Subwoofer driver diameter (imperial): 12.7 cm (5"), Subwoofer dimensions (W x D x H): 232 x 158 x 230 mm. Power source: AC, AC input voltage: 100 - 240 V, AC input frequency: 50 / 60 Hz. Connectivity technology: Wired, Headphone connectivity: 3.5 mm