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The Contour Lite Chest Transmitter - Cardio Sport monitors have a one piece chest transmitter. It is possible to change the transmitter battery at home - watch batteries should be changed by a jeweler. Batteries are standard 3 volt lithium available for approximately $3.00 or less at Radio Shack or similar store. Battery life is approximately 1.5 - 2 years in both watch and transmitter. While Cardio Sport units are water resistant, they are not recommended for swimming.
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