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Watch Knowledge: 1. What is the acceptable margin of error for a watch? The general mechanical watch allows an error of about 30 seconds per day, while quartz watches allow about 15 seconds per month. The specific error depends on the movement used in the watch. 2. How long is the lifespan of the watch battery? The battery life usually ranges from 1 to 5 years, depending on the type of watch, size, and the energy required by different functions.For example, a chronograph consumes more energy than a watch that only indicates hours and minutes.When the second hand starts jumping every 4 seconds, it's time to replace the battery. 3. Can I wear the watch while swimming or bathing? Waterproof for daily use (Waterproof 30m or less): Can prevent sweat, rain, or water droplets from washing face.Although it can prevent splashing water drops, it is not suitable for bathing, swimming, or diving. Reinforced Waterproof for daily use (Waterproof: 50m , 100m , 200m ): Can be used for tasks that frequently involve water or sports (swimming, surfing, etc.) or snorkeling. Diving Waterproof (Waterproof: 200m and above): Can be used for snorkeling or scuba diving. Different diving depths can be divided into waterproof for air diving, waterproof for saturation diving, and professional (600mm1000mm) waterproof functions. Do not wear any watch while bathing 4. How to ensure that the watch can last for many years? Magnetic field: Please do not expose the watch to strong magnetic fields, such as near amplifiers, electric refrigerators, and other electromagnetic devices. Sea water: After contact with sea water, you must clean your watch with clean warm water. Crown: Depending on the watch model, carefully press or turn the crown inward to ensure that water does not enter the mechanical device. Cleaning: For metal bracelets and all Waterproof cases, clean with a toothbrush dipped in soapy water and dry with a soft cloth. Chemical products: Avoid direct contact with solvents, detergents, perfumes, cosmetics etc. as they may damage the bracelet, case or gaskets.