USB Bluetooth Multimedia MP3 Player is not only a wireless Bluetooth portable speaker, but also a radio / MP3 player. It has a built-in a micro SD(HC) which can read micro SD(HC) memory card for playing MP3/WMA audio file directly. It also allows you to wirelessly listen to digital-quality music with your computer, MP3 player, home stereo, cellular phone, or any device that supports Bluetooth stereo audio (A2DP). You can also 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.