The C-Phone 4 has been designed to provide full round robin communications between the tender, 2 working divers and 1 standby diver, with an additional channel that can be used by other personnel such as deck support crew. The clearly labelled panel facia with heavy duty connectors make it easy to operate while providing longevity in service. Housed in a waterproof, ruggedised Storm case and supplied with a heavy duty C-Tecnics headset and charger.