HM205RB Speaker Microphone for M506 and M605 Radios
HM205RB is the speaker microphone that comes standard with the rear microphon version of M506 and all M605 series radios. HM205RB mics are equipped with channel up/down buttons, [H/L], [16/C], and [PTT] keys, a speaker and microphone.
The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.