SHURE BLX SM58 HANDHELD SYSTEM. Shure BLX¨ Wireless Systems combine professional-quality sound with simple setup and an intuitive interface for legendary audio performance right out of the box. Precision-built and available in a variety of configurations, itÕs the most accessible way to own the stage. Includes BLX4 single-channel receiver, BLX2/SM58 handheld transmitter, microphone clip, power supply, 2 AA batteries, and user guide. Please email us if you have any questions. Every product from EMI Audio comes with the balance of the Manufacturers warranty or a 90 day EMI Audio guarantee.