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The Polar transmitter detects your heart rate and transmits it to the wrist receiver. 1. Carefully wash the transmitter with a mild soap and water solution. 2. Rinse it with pure water. 3. Dry the transmitter carefully with a soft towel. 4. Keep the wrist receiver clean and wipe off any moisture. 5. Store the heart rate monitor in a clean and dry place. Dirt impairs the elasticity and functioning of the transmitter. Sweat and moisture can keep the electrodes wet and the transmitter activated, wh