Edifier Prowler. Audio output channels: 2.1, RMS rated power: 21 W, Recommended usage: PC. Total Harmonic Distortion (THD): 10 %, Signal-to-Noise Ratio (SNR): 85 dB. Satellite speaker type: 1-way, Satellite speakers RMS power: 9 W, Satellite speaker impedance: 4 Ом. Subwoofer type: passive, Subwoofer impedance: 6 Ом, Subwoofer driver size: 114.3 mm (4.5 "). Power source: AC