Bluetooth function, USB Flash Disk /SD card Play Back, AUX Input 6 ½ inch bass and 3 inch mid-range drivers Integrated side control panel makes system adjustments easy and convenient IR remote control to select source directly Six buttons for audio source selection, previous/next track, play/pause and volume up/down USB/SD card playback supports breakpoint memory function Able to memorize mode and volume Support USB/SD card folders change