Montre d'étudiant multifonction étanche à double affichage LED OHSEN Aosheng 1309 avec calendrier des jours de la semaine

"> [Function]: (1) 12 slot display (hour, minute, second, month, day, week) (2) Stopwatch function (1/100 second accuracy) (3) Alarm clock (with snooze function), hourly chime (4) Night Light Function (5) 30m Waterproof, anti-shock Warm reminder: Please do not operate the watch in water (6) 12/24 hour format selection [Performance]: 30m Waterproof (please do not operate buttons in water), anti-magnetic, anti-vibration 3-year long-lasting battery [new] There are OHSEN news on both the surface and the case back [Design] Fashionable, trendy, sporty, innovative style, meticulously crafted, consistent quality Movement The movement is the most important component of a watch; it's the heart of the watch. Its quality determines the overall quality of the watch. Choosing a high-quality movement is crucial for product quality.Japan's original Citizen mechanical fully automatic movement has a defective rate of only 5new, with a daily error of 15 seconds; domestic fully automatic mechanical movements have a defective rate of 7new, with a daily error of 30 seconds.The Seiko quartz movement is currently the most commonly used movement in many domestic and international watches, with a product defect rate of only 3new and a monthly error of 30 seconds.Among the many brands of movements, the Seiko movement stands out for its impressive features and exceptional accuracy, earning unanimous praise in both international and domestic markets.The quality of domestic fully automatic mechanical movements has been continuously improving in recent years, and their quality is relatively stable. (B) Watch Case At present, domestic market watch cases mostly use alloy cases, copper cases, steel cases, and other cases. 1. Alloy shell: Generally speaking, the craftsmanship is simple, the production cycle is short, the output is large, and the cost is low. It has developed rapidly in recent years.However, due to its shortcomings in terms of waterproofness, wear resistance, and corrosion resistance, it is rarely used in large-scale celebrations. It is mostly used in areas such as beer and beverages.It belongs to the mid to low-end category of watches. 2. Copper shell: Copper shell has the advantages of being easy to use, beautiful, with good waterproof performance, surface wear resistance, and corrosion resistance.Many are adopted.Its moderation is also its advantage.It belongs to the high and mid-range category of watches. 3. Steel case: Generally speaking, it is more complex, with small production volume and higher cost. Its performance is superior to alloy cases and copper cases, often used in high-end electronic watches and mechanical or fully automatic mechanical watches.It is a high-end watch. 4. Tungsten steel case: difficult to wear out, equipped with a blue dial cover, Japanese movement, and tungsten steel strap.This watch is generally a high-end electronic watch. Strap The choice of watch strap should generally match the watch case; choose the same material for the strap as the case.There is one situation that can be excluded, which is that any material watch case can match with a leather strap, and the effect is quite ideal. Dial The dial material is generally made of copper, aluminum, or paper. For a watch, the design of the dial is also very important. In our industry, the dial is called the face of the watch, as important as a person's appearance. The same watch case can achieve different effects by pairing it with different patterns and materials for the dial.