The Icom HM-205 series mics are equipped with channel Up/Down buttons, High/Low (transmit power), 16/C (channel 16 or call channel), PTT keys and a 45 mm high sound pressure speaker and microphone. This microphone has a rear connector (round plug). For Icom IC-M506, IC-M506EURO, IC-M510, IC-M604, IC-M605 radios.