Wireless Powered Dual Speaker and Transmitter has built-in 250 watt amplifier and receiver and two 6.5" NEO woofers and dynamic compression tweeter. It includes a Transmitter which connects to the line-out or record-out jack on the SW915 for a cordless link between the main PA and the Speaker within the 300 ft. reception range. Built-in rechargeable batteries and AC Power cord. All built into cabinet with handle and wheels.