The specifications for the SG-D9 speaker:
Speaker System: 2.0 (Stereo)
Rated Power: 3.5W x 2
Maximum Power: 3.5W
Impedance: 4 ohms
Signal to Noise Ratio: 58 dB
Frequency Response: 20 Hz - 20 kHz
Distortion: Less than 1% at 80 Hz - 20 kHz
Connectivity:
USB 2.0 for power
3.5mm audio jack for sound input
Additional Features:
Volume control
Compact and portable design