... MMC/MS,USB flash, MP3,WMA Built-in Battery mini portable Speaker with SD/MMC/USB,FM Radio and ... Taiwan`s A-star the original low-power digital amplifier (3W x 2) 2 inch high fidelity speaker ... Digital volume control Built-in 600mA lithium ion battery, ... is low, the top will flash the alarm) Standard mini-usb charging port, is compatible with most mobile phone / ...