Features: 1.Compatible with notebooks, desktops, laptops, PCs, smart phones, tablets, MP3, MP4 and more devices 2.USB power supply and 3.5mm audio input, just plug the USB cable into the device, then plug the 3.5mm socket into the audio device to use 3.This USB speaker can work with for Win and for OS X, no drive required, plug and play 4.Contain a pair of speakers, laptop USB speakers provide clear and rich stereo effects for your computer 5.Totally antimagnetic speaker unit designs can guarantee that the sound is not disturbed specification:Item Type: USB Speaker Socket: USB+3.5MM Output Power: RMS 3Wx2(THD1%) Frequency Response (Hz): 100-20KHz Speaker Unit: 2 x 2 inches, 4 ohms (fully anti-magnetic) Input Current: USB power supply (5V) Signal to Noise Ratio: 85dB (A) Main Box Line Length: Approx. 55mm / 2.2in USB Cable Length: Approx. 85mm / 3.3in PackageList:1 Pair of USB Speaker