The Shure BLX14R/W85-H8E Wireless System operates within the 518-542 MHz frequency band. The WL185 lavalier microphone features a wide dynamic range for accurate sound reproduction and an interchangeable cartridge. The ability to switch out the cartridge allows users to choose between different polar patterns to match the environment whilst a rotatable clip pivots 90 degrees for precise and flexible positioning. This wireless system offers analogue wireless transmission and includes the BLX1 bodypack transmitter BLX4R wireless receiver and the WL185 lavalier microphone. 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.