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.‎