KD-MN02 Multi-functional Super Mini Audio Speaker Amplifier with TF/ USB Slot for PC Mobile Phone MP3 Player (Blue) No Battery Needed. Charge by USB This mini speaker has compact size and light weight. with FM USB disc,Micro SD card support Music player-allows you to enjoy music anytime anywhere charm. connect your MP3, MP4, CD, Ipod, Iphone, PSP, mobile phones, computers. Metal, circular design, button curved design, a variety of colors, highlights the modern style, make you own way.