Cut out the complexity. With the Shure GLXD24R/B58 Digital Wireless System youre free to perform the way you want to. This GLX-D Advanced system takes the prestigious pristine sound and simple setup from the GLX-D series and adds dramatic enhancements. The SM31 Fitness Headset bodypack transmitter and an ultra-powerful GLX4R receiver all work together in harmony. Giving you the freedom deserve with performance you can trust. Take advantage of a rugged rack-mountable receiver with more efficient and effective frequency management. With the ability to work hand-in-hand with Shures Advanced Frequency Manager device you can build a system of any size with astounding flexibility and power. Complete with intelligent LINKFREQ technology true diversity operation and Shures legendary build quality this is a system you can truly rely on. Night after night year after year.