The Shure BLX14RE/SM35-H8E Wireless System operates within the 518 - 542 MHz frequency band and is perfect for active performers and multi-instrumentalists who enjoy the freedom of moving around on stage. The wireless system offers analogue wireless transmission and includes the BLX1 bodypack transmitter BLX4R wireless receiver and the SM35 Cardioid Condenser Headset Mic. The BLX4R receiver comes with a rack mount kit and removable antennas for quick and intuitive operation. The BLX system range prides itself on professional sound that is easy and efficient to setup giving you the freedom to perform with quality.