The Shure BLX4 Wireless Receiver is a high - performance receiver for the BLX Wireless System, operating within a frequency range of 572 MHz to 596 MHz. It features a frequency response of 50 Hz to 15 kHz, ensuring clear and accurate sound reproduction. With an impressive operating range of up to 299.87 feet, this receiver is ideal for live performances, presentations, and other applications where mobility is key. The durable design includes XLR and ¼" output connectors, making it compatible with a variety of audio equipment. The two - color audio status indicator LED provides real - time feedback on audio levels, with green indicating normal levels and red signaling excessive levels. The BLX4 also features simple setup and intuitive controls, along with microprocessor - controlled internal antenna diversity for reliable performance. One - touch QuickScan frequency selection allows users to quickly find the best open frequency in case of interference, ensuring uninterrupted audio transmission.