F&D A520 2.1 Multimedia Speaker has 4 inch full range driver for satellites and 6.5 inch bass driver for subwoofer. Heavy duty metal grill subwoofer design. Built in AVR Automatic Voltage Regulator for wide main operating voltage range. High efficient energy saving design for Low Power Consumption. Side panel controls for volume and bass. Green LED power on indicator. Wooden cabinet delivers strong and low distortion bass.