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Specifically designed as an acoustic underwater telephone for the Sport Diver Utilizes new super mic which is noise cancelling and fully floodable to any depth Your second stage regulator easily installs to the HM-2 mouth mask Unique push-to-talk system Uses ultrasonic upper single sideband for transmission Provides moderate range and clear diver-to-diver voice communication Powered by one 9-volt battery (not included) NOMINAL RANGE: 50 to 500 meters depending conditions OPERATING DEPTH: 130 Feet of Sea Water BATTERY TYPE: 9 volt BATTERY LIFE: 8 to 10 hours