Notebook USB speakers, USB plug for power, Audio systems: Frequency range: 20Hz-20kHz, Input impedance: 10ohm, Output power in total: 3W, Signal/Noise ratio: >75dB, THD: <1%, Audio systems L/R channels: Class-AB Amplifier, Channel separation: >45dB, Input sensitivity: 600mV, Rated output power: 1.5W X 2, Left/Right speakers: Driver power range: 1-5Wx2, Frequency range: 75Hz-20kHz, Norminal impedance: 4ohm, Sensitivity: 85dB(2.83V/1m), Speaker driver: 2.5", Cable length: 1.5 m, Connector: 3.5 mm stereo, Product dimensions (W x H x D): 15.8 x 12.1 x 8 cm, Weight: 0.601 kg