Patent ID: 8094518

Claim:
An underwater transceiver worn by a first diver for signaling to a second diver, comprising: a power source, input/output leads, a computation unit powered by said power source for generating outgoing signals and processing incoming signals, an electromechanical transducer which generates outgoing compression waves corresponding to said outgoing signals generated by said computation unit, and said electromechanical transducer transducing incoming compression waves to said incoming signals for said processing by said computation unit, a beam-interrupt button having a light source producing a light beam directed towards a light detector, said light source and said light detector being separated by a gap into which a finger of said first diver is insertable to create an interruption in said beam, said interruption in said beam being detected by said computation unit and transmitted via said outgoing signals, and a chassis completely and permanently encasing said power source, said computation unit, said light source, said light detector, said electromechanical transducer, and interior portions of said input/output leads, exterior portions of said input/output leads being exposed to the environment.