This Stilo Offshore intercom is encased in a fully watertight case and is designed to run off the boats power supply. With up to six helmet connections, each with a Stilo 4 way male Nexus connection, it can cope with a large number of crews. The unit comes with a push to talk button and connect the ship to shore via the boat's radio, this connected via the intercoms wiring loom. With adjustable volume control, you can preset the correct level required to suit the noise levels of the boat.