(2) Phonic WM-SYS3-863 Wireless Systems for Active Speakers Transmitter+Receiver Phonic WM-SYS3-863 Wireless System for Active Speakers with Transmitter and Receiver 12VDC external power supply (country dependent) 16 user-selectable frequencies Operating range: 210 ft. (70m, environment dependent) Audio output connectors: XLR out