Shure BLX4 Tabletop Wireless Receiver (H11: 572 to 596 MHz)Key Features For Small Venues and Conference Rooms Single Channel, Portable Tabletop Design 123 Auto Scan Frequencies Internal Antenna Diversity Expandable to 12 Mic Channels 300' Range The Shure BLX4 is a single channel tabletop wireless receiver compatible with the BLX1 bodypack and BLX2 handheld transmitters. Compact and lightweight, it houses internal antennas and is ideal for portable use. The BLX4 features one touch QuickScan frequency selection