Features: -Small and lightweight, you can take this portable speaker in your pocket -This USB speaker could provide you ultra-portable mini stereo system -Enjoy your music without headsets or large wires external speakers -Power by plugging the USB power cable into virtually any USB port, or by connecting to the AC wall outlet adapter(adapter not included) -No recharging function, only work through USB port Suitable for PC, MP3, MP4, laptop computer Descriptions: -Cabinet Material: Plastic -Communication: Wired 3.5mm plug and USB interface power Special Feature: -Portable, Mini Use: Portable Audio Player Specification: -Input Power: USB DC 5V - Speaker Dimension & Impedance: 4? -Output Power: 5W -Frequency Response: 90Hz-20kHz -Sensitivity: 80dB+-2dB -SNR >= 80 dB What's in the box -2 x Mini Speaker set