The GLXD14/PGA31 Headworn Wireless System is part of the GLX-D wireless systems family. 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, GLXD1 bodypack transmitter, PGA31 headset microphone, power supply, clothing clip, windscreens, rechargeable battery, and user guide.