Bluetooth speaker with clear and potent sound, made with resistant material for heavy duty and shock proof. Rechargeable battery, output power of 6W. multi-function design: Bluetooth, AUX Input, Micro SD card, USB Input & hands-free calling. FM Radio. Frequency: 20HZ-2KHz. This speaker has the function of TWS (True Wireless Stereo) Allows you to connect two IRocker IR 200B for stereo sound experience. Amazingly Portable Design can be taken anywhere!