Logitech Z407 Bluetooth computer speakers with subwoofer. Audio output channels: 2.1 channels, RMS rated power: 40 W, Recommended usage: PC/Laptop. Signal-to-Noise Ratio (SNR): 75 dB. Satellite speakers RMS power: 10 W, Satellite speaker peak power: 20 W, Satellite speaker impedance: 8 Ω. Subwoofer RMS power: 20 W, Subwoofer impedance: 4 Ω, Subwoofer dimensions (W x D x H): 234 x 180 x 240 mm. Power source: AC, AC input voltage: 100 - 240 V, AC input frequency: 50 / 60 Hz