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This instructional video demonstrates Recreational Uses for a Buddy Phone or a Dual GSM Communication System. There are several communication systems such as the Ocean Reef Dual GSM Communication System and the Ocean Technology Buddy Phone. The patented XT-100 Buddy Phone transceiver has been specifically designed as an acoustic underwater telephone for the Sport Diver. It uses ultrasonic upper single side band for transmission. The diver utilizes his own face mask and 1st and 2nd stage regulator. Now if you wish to also communicate with your friends above the water line, then you might want to consider the Ocean Technology Buddy Phone Surface Station. It features a Simple PTT (Push To Talk) system which you press the microphone button to talk and release to receive.