M-105 D Mariner is a surface to diver communication unit that may be installed on board a boat. It has the same operations and technical characteristics of the M-105; however, the M-105 Mariner uses a 12 v power source. The cable and transducer may be made to different lengths to accommodate fixed installations. It not only connects to a main power supply, but also to an internal loudspeaker system. The M-105 D Mariner kit includes: