The F&D A521 2.1 Multimedia Speaker 5500W With USB & MMC is feature-packed and delivers rich, powerful and crystal-clear sound. It features a plug & play USB/SD card reader. The USB/SD reader supports MP3/WMA dual formats decoding. It is also designed with Play/Pause, Next, Previous three buttons for USB/SD reader control. It has 4 inch full range driver for satellites speakers andpowerful 6.5 inch bass driver for subwoofer. It also features a high efficient energy saving design that aids in low power consumption. The wooden cabinet on the other hand delivers strong and low distortion bass. It has side panel controls for volume and bass. The built in AVR (Automatic Voltage Regulator) is for wide main operating voltage range. It comes with aheavy duty metal grill. To top it all, it has a green LED power on indicator