DEFENDER series QD® QUICK-DISCONNECT Lapel Microphone w/C-Shape Ear Hanger. The unique C style earpiece is similar to the popular D style but ADJUSTABLE so can fit any ear size.
Motorola unique 1-pin that screws into jack. Used mostly with Motorola BDN6676 and HLN9717 adapters or Pryme PA-BDN6676 and PA-HLN9717 adapters.