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Bell & Ross Hydromax watch has been designed to perform in the most extreme underwater diving conditions. Tests in hyperbaric tanks have proved the watches' resistance at 1110 bar, equivalent to 11100 metres. This performance is due to a major technical innovation: a watchcase completely filled with a transparent oil called Hydroil. This liquid guarantees perfect water-resistance and incomparable readability. In addition, it guarantees extremely reliable and silent operation. The Hydromax features a quarts movement with an analog display (expected battery life between 4 and 5 years).