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 BLX4R rack mount receiver, BLX2/SM58 handheld transmitter, microphone clip, single and dual rackmount kit, two 1/4 wave antennas, zipper bag, power supply, 2 AA batteries, and user guide.