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The M100 is a portable surface transceiver unit that may be worn on the operator?s belt. This is a high performance, compact, and easy to use unit. It is made to respond to the demands of communicating with divers in action.The main unit has a PTT (Push to Talk) button and a headphone/microphone connector. The unit turns on when the headphone/ microphone is connected to the main unit. The unit turns off automatically when the headphone/microphone is removed. A 10 meter (30 feet) transducer cable connects to the main unit and is lowered into the water. The operator may control the depth of the transducer. It operates on one channel and uses a 9v replaceable alkaline battery with autonomy of approximately 9 hours. The range of operation is approx 250 meters (750 feet). The unit comes with the following items: