If the watch stops unexpectedly while being worn, the time error will become larger and energy storage needs to be maintained.Ordinary glass is polished and hardened. It is a crystal made of silicon (silicon dioxide) and lead oxide. It has good gloss and very transparent characteristics. It is more wear-resistant than plexiglass, but not as good as sapphire. Crystal (glass will scratch a lot after a long period of time; vertical impact resistance (hardness) is stronger than sapphire crystal, usually used in military watches or low-end brands, it feels cold, and there is sapphire crystal glass (SAPPHIRECRYSTAL)? ? This is the most common material that everyone has seen.
Currently, the devices widely used to monitor exercise heart rate data are smart bracelets and watches, but because most smart bracelets work based on reflective photoelectric signal detection, that is, detecting light reflection based on the light transmittance in the blood.Patek Philippe watches he always attached importance to shape design and production process.