Marine radio telephone is the GMDSS system important component. It includes two types, marine fixed radio telephone device and portable radio telephone. The fixed radio telephone can send and transmit the distress signals and make safe communication in emergency. The portable  two-way radiophone can be used in daily communication between ships or emergency  communication between people with risks and nearby rescue groups. Both of the two types radiophone products have the advantages of rigid structure, watertight and anti-corrosive shell and transmitting clear voice.