Revolutionary Shure GLX-D® Digital Wireless Systems combine leading-edge LINKFREQ Automatic Frequency Management technology with best-in-class intelligent lithium-ion battery rechargeability to define the new standard for seamless operation and digital audio clarity. Includes GLXD4 receiver, GLX2/SM58 handheld transmitter, microphone clip, power supply, rechargeable battery, USB cable, carrying case, and user guide.