1,Support SD,USB to play music 2,Remote controller and pannel key operation 3,FM radio 4,Various sound 5,USD4.5 per unit Detailed description of product functions:1, Standard USB2.0 plot, could read SD/ SDHC / MS/ MMC card and USB Flash and play MP3 format music automatically and intelligently .2, FM radio function(Built-in FM antenna).3, Clock, alarm function.4, Built-in rechargeable lithium ...