Bluetooth speaker with clear and potent sound. 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 300B for stereo sound experience. Made with resistant material for heavy duty and shock proof. Rugged Design with Carry Handle which makes this speaker extremely convenient to take your favorite music anywhere!