Do not allow the watch to come into contact with thinner, gasoline, solvents, fats, or oils, or any cleaners, adhesives, paints, medicines, or cosmetics that contain such ingredients. Such contact can cause discoloration of, or damage to a resin case, resin band, leather, and other parts. Sunblock, hand cream, cosmetics, and other skin applications coming into contact with the back cover of the watch can soil the sensor window, which can cause interference with heart rate accuracy. Avoid use of such skin applications when performing heart rate measurement.
