Shure GLXD24SM58 Wireless Handheld Microphone System The new ground breaking GLX-D Wireless Systems from Shure combine the leading edge of LINKFREQ Automatic Frequency Management technology with best-in-class intelligent lithium ion battery recharge ability, world-renowned microphones and unparalleled design and construction. Available in a wide offering of bodypack and handheld configurations – including vocal, headset and presenter systems as well as traditional and pedal-mounted guitar options. The revolutionary GLX-D Wireless Systems define the newest standard for seamless ease of operation and exceptional digital audio clarity. You can also find the best frequency for your location with the Shure Frequency Calculator.