Shure -GLXD14+UK/SM31-Z4-Z4Wireless Microphone System (Headset Microphone). GLXD14+UK/SM31-Z4. MPN GLXD14+UK/SM31-Z4. Model GLXD14+UK/SM31-Z4. The new GLX-D+ Dual Band Wireless Headset System features the versatile SM31FH Headset Microphone for spoken word applications and the GLXD4+ tabletop receiver.
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