This mini speaker can be deemed as perfect combination of classic and modern performance. It is portable aluminum vibration film loud speaker, which has clear alt and pure woof. The unique design makes tone performance perfect. High quality portable speaker. It has built-in Lithium battery, can play music and sync charge when use USB power. Directly connection to personal computer, MP3, MP4, DVD, CD, iPod, iPhone, GPS, PSP, Mobile phone, flash disk and SD card. It can play music by inserting the flash disk, Micro SD card and MP3 directly (It can only decode .mp3 format music).