Edifier M1380. Audio output channels: 2.1, RMS rated power: 28 W, Recommended usage: PC. Amplification device type: amplifier, Amplification device form factor: built-in, Total Harmonic Distortion (THD): 10 %. Satellite speakers RMS power: 16 W, Satellite speaker mid-range driver size: 69.8 mm (2.75 "). Subwoofer RMS power: 12 W, Subwoofer driver size: 127 mm (5 "). Power source: AC