Things to note: 1. The watch is a precision mechanical product. Please avoid bumps, falls, shocks, or strenuous exercise while wearing the watch! It will cause parts damage, inaccurate running time or stopped running, etc.! It is recommended to take off your watch and exercise 2. A fully automatic mechanical watch must be worn with sufficient activity, that is, it must be worn for more than 10 hours a day, before it can operate normally! Power source: The swing of the wearer's wrist generates energy to wind the spring. If the swing is insufficient, it is recommended to fully wind the mechanical watch frequently. If the kinetic energy is insufficient, it will stop and even cause inaccurate timing! The error of a fully wound mechanical watch is around 45 seconds per day. Other precautions: Please note that it is anti-magnetic and cannot be used in hot water, sauna and other temperature changing environments. The above conditions will affect the travel time of mechanical watches.