Cobra Electronics CM330001 CobraMarine Lapel Speaker Microphone Compatable With CobraMarine Handheld VHF and most GMRS GROUP+ambassador marine 2 drain straight drain low profile 1 1 4 m thread with chain stopper It allows PowerControl and PowerAssist It allows PowerControl and PowerAssist current limit setting for two AC sources: a generator and shore side current for example The plate contains different combinations of pre drilled holes which will match up to many electronic devices and mounts Allows operation of the radio without removing the radio from it's holster and in high ambient noise environments Features & Specifications