KD-MN02 Multi-functional Super Mini Audio Speaker Amplifier with TF/ USB Slot for PC Mobile Phone MP3 Player Green High density metal shell shows noble and fashionable, out of ordinary, with many colors, several solution for your option This compact travel speaker system is ideal for use at the office, home, outdoor Several power supply ways including battery, computer USB Jack, adaptor DC/5.5V, allow you to enjoy the charm of digital products at any time Support USB 2.0 High speed transmission and USB disc music playing Mini audio box with new concept integral stereo portable mobile music, connecting your MP3, MP4, CD, DVD, iPod, iPhone, PSP, mobiles, computers