Shure BLX4R Rackmount Wireless Receiver (H11: 572 to 596 MHz)Key Features For Small Venues and Conference Rooms Single Channel, Rackmount Design 123 Auto Scan Frequencies Two Removable Antennas with Diversity Adjustable Output Level Rugged Metal Construction Expandable to 12 Mic Channels 300' Range The Shure BLX4R is a single channel wireless receiver compatible with the BLX1 bodypack transmitter and BLX2 handheld transmitters. It features a rugged metal chassis and, using the included hardware, can be