USB Bullet MP3 Player is not only a portable speaker, but also a radio / MP3 player. Built-in a USB port and SD card Slot which can read SD(HC)/MMC memory card and USB memory for playing MP3/WMA audio files directly. It also allows to connect to all iPods, MP3, MP4, MD, CD player, notebook, PC, PDA, PSP, mobile phone and other digital products with 3.5mm stereo audio connector. Built in Lithium Ion battery - convenient to use. It gives you a retro feel and can be a decoration for your desk.