The Wi Digital Systems Wi Pro AudioMatrix R1 Receiver is compatible with active loudspeakers, PA systems, mixers, and DJ gear. This portable, battery-powered, 2.4 GHz Stereo Digital Multicast Wireless Audio Receiver is an add-on accessory for the Wi AMP50 that enables users to create a customized simultaneous stereo digital wireless audio distribution matrix from one transmitter to up to 50 stereo digital wireless receivers without the need to route cables to speakers or run cables from one room to another.