Features: Cool and cute speakers: You can share great sounds with friends or family. Compact and lightweight: You can put this portable speaker in your bag. This USB speaker gives you an ultra-portable mini sound system. Enjoy music without headphones or large wires for external speakers. Power is supplied by plugging the USB power cord into almost any USB port, or by connecting to an AC outlet adapter (not including an adapter). No charging function, only work through the USB port. Suitable for PC, MP3, MP4, laptop. Specification:Material: PlasticColor: BlackAudio Track: Dual track, Single track (optional)Output power: 2.5W + 2.5WImpedance: 4 ohmsFrequency response range: 90Hz - 20KHzSignal to noise ratio: ≥80dB Distortion: ≤0.3%Power: USB / DC5VPackage list:1 * Pair of Speakers