Hercules 20, 2.1 channels, 9 W, PC/Laptop, Black, Metal, Plastic, Wood, Rotary Hercules 20. Audio output channels: 2.1 channels, RMS rated power: 9 W, Recommended usage: PC/Laptop. Satellite speaker type: 1-way, Satellite speakers RMS power: 4 W, Speaker depth: 3.15" (8 cm). Subwoofer RMS power: 5 W, Subwoofer width: 5.12" (13 cm), Subwoofer depth: 6.89" (17.5 cm). Power source: AC. Cables included: AC