Handheld Wireless System with BETA58A handheld microphone. 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, it’s the most accessible way to own the stage. Includes BLX4 single-channel receiver, BLX2/PG58 handheld transmitter, microphone clip, power supply, 2 AA batteries, and user guide. Frequency: 518-542 MHz