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Daily watch maintenance and watch knowledge: 1. Please do not bring the watch close to magnetic objects 2. If there is water ingress or air, it should be immediately sent to the repair center for cleaning to prevent the movement from rusting 3. If there is a protective film or label attached to the watch back, please remove them before use, otherwise sweat will penetrate into the protective paper and cause rust on the watch back 4. Please do not expose the watch to various solvents and chemicals, as this may cause corrosion and discoloration of the case and strap 5. The watch is limited to quartz watches that can operate stably and accurately within the range of 5C to 35C at room temperature. Exceeding 50C may cause battery leakage or shorten its lifespan Battery life.Do not leave the watch in a low-temperature environment of -10°C for a long time, as air conditioning can cause the time to slow down or speed up. Once the watch returns to room temperature, its operation will return to normal 6. Watches can be divided into diving watches, waterproof watches, and non-waterproof watches based on their waterproof performance.The waterproofing of watches relies on the waterproofing gaskets at the watch glass, case back, and crown to meet the corresponding standards, which are categorized into different levels 1 Sweat-Resistant: It's very easy to understand; it simply prevents sweat from getting inside the watch 2 General Waterproof WATER-RESISTANT: It's okay if you occasionally encounter water. For example, if you water the flowers and accidentally spray it on your hand, don't worry, just take it off and wipe it clean, and it'll be fine. In short, it's for preventing small splashes of water in daily life 330m Waterproof 30M, 3ATM, 3BAR: Watches with the label 30M are waterproof watches and can be used for daily activities or in the rain. However, they are mainly designed to prevent the movement from being damaged by dust and moisture.30m Waterproof, according to professionals, each square centimeter can bear a pressure of 3kg which is approximately equivalent to a water depth of 30m at rest state, equal to the pressure of three atmospheres. For us ordinary consumers, we just need to remember that 30m is the most basic and elementary level of waterproofing 450m Waterproof 50M, 5ATM, 5BAR: Watches with the label 50M are 50m waterproof watches, which are truly waterproof watches in the minds of consumers and can be used for swimming and general household waterproofing.Remember not to adjust the watch crown in water 5Diving Watch 100m Waterproof, 200m Waterproof, 300m Waterproof, etc. are professional waterproof watches that can be used for swimming and diving and other underwater activities. Warm reminder: 1. Any Waterproof watch should not be exposed to hot water or steam, such as taking a hot bath or sauna; 2. Try to avoid using it in environments with significant temperature changes. The temperature difference can cause moisture in the watch's air to condense, leading to water ingress and fog formation inside the watch. If there is fog inside the watch, please take it to a professional watch repair shop for cleaning and maintenance as soon as possible 3. After all, watches are precision instruments; please handle them with care. Good usage habits can extend the lifespan of your watch, while bad habits will shorten its life.