Sennheiser Evolution EW100 - SKP 100 Plug-on Transmitter Component Identification

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SKP 100 plug-on transmitter
 Microphone input, XLR-3 socket
 Mechanical locking ring of XLR-3 socket
 LC display
 SET button
  button (DOWN)
  button (UP
 MUTE switch
 Battery compartment
 ON/OFF button
 Red LED for operation and battery status indication