Icom M400BB VHF Marine Black Box Radio with Black Command Mic [M400BB 31]M400BB VHF Marine Black Box Radio with Black Command Mic Black Box Transceiver When Space Is At A Premium Icom's M400BB is a VHF fixed mount with Class D DSC. The M400BB is a spacesaving unit, ideal for owners of compact boats and shipbuilders looking for a black box solution. The M400BB comprises only a black box main body and a supplied COMMANDMIC HM195 remote control microphone accessory. The two piece radio set can easily be installed behind a