Powerful Speaker System. Streams Music Wirelessly from Most Bluetooth Enabled Devices Such as iPhone , iPad , iPod , Smart Phones, Netbooks, Computers, Android Tablets & More. Built-in USB Input Connects Audio Devices that Uses a USB. SD Card Slot Input Plays your Favorite Songs From your SD. Aux Input to Connect Wired External Audio Players. FM Radio. Frequency Response: 55Hz 220Hz 220Hz 18KHz. Speaker Unit: 4"+3" x 2. P.M.P.O.: 680 W. S/N Ratio: 68dB. Distortion: 0.3% 1W 1KHz. Output Power: 10W+5W x 2. AC Power: Dual Voltage 110V-240V. DC Power: 10V/1.5A.