Logitech Multimedia Speakers z533. Audio output channels: 2.1 channels, RMS rated power: 60 W, Recommended usage: Universal. Satellite speakers RMS power: 15 W, Satellite speaker impedance: 4 Ω, Satellite speaker tweeter diameter: 6.6 cm (2.6"). Subwoofer RMS power: 30 W, Subwoofer impedance: 6 Ω, Subwoofer driver diameter (imperial): 13.3 cm (5.25"). Power source: AC, AC input voltage: 100 - 240 V, AC input frequency: 50 / 60 Hz. Cables included: Audio (3.5mm)