P-9016 is a weatherproof command intercom system substation for industrial and noisy environments such as engine, steering gear and thruster rooms. It interfaces an external loudspeaker, an external call signal device (flash/rotating light/hooter/siren) and a pluggable hearing protective headset. The unit is equipped with a loudspeaker/headset selector toggle switch, a CALL button for attention request and a call lamp for visual call indication.