Love this mic and it was inexpensive too! Great find!
RSM-H2: The RSM-H2 is Our Replacement for the Hytera X1e and X1p shoulder microphone. Our replacement remote speaker microphone features coil cord and swivel clip and a 3.5mm audio jack for an add-on earpiece.
For use with Hytera:
Compatible Alternatives: SM18A4, SM26N1, SM26N2