Artificial sapphire Artificial sapphire is made of fine alumina powder as raw material, formed in a furnace at a certain temperature of Celsius, and then made through countless processes. The hardness is second only to diamond and is equivalent to seven times that of steel. 100 meters waterproof 10 bar water resistance: suitable for swimming and shallow diving. This elegant men's watch has a 100-meter water resistance, so there is no problem in wandering in the water for a period of time, even during long snorkeling trips. Our PAGANI DESIGN watch has a rubber gasket to withstand high pressure. Safety folding buckle In order to make up for the shortcomings of traditional pinhole straps, watch folding clasps have been born with two-fold and three-fold straps. Their biggest advancement is to use the pinhole as only a part of the fixed strap, using the pinhole to fix the strap, and the other end is a metal folding buckle. Greenwich Mean Time-GMT The local time on the Greenwich Meridian, or the zone time in the zero time zone (middle time zone) is called Greenwich Mean Time (also translated as "Greenwich Mean Time"), also called "Universal Time". Instructions for use How To Use: Slowly turn the crown clockwise (in the 3 o'clock direction) to wind the mainspring. Pull out the crown to the first positon to set date counterclockwise(in the 6 o'clock direction). Pull out the crown to the second positon to set time counterclockwise(in the 6 o'clock direction). ATTENTION!!! DO NOT set the time and date in wrong direction If your watch is completely stopped, it is recommended that you manually wind the mainspring by turning the crown. Kindly Remind:Manually winding the mainspring by turning the crown between 20-25 turns in 5-7 hours,the watch will get enough power. NOTE!!! Please keep the watch away from magnets which may damage the movement Waterproof rubber rings are prone to aging and deterioration, and should be replaced regularly.Damage to the watch glass can affect the waterproof performance of the watch, and it should be replaced in time if it breaks. Do not operate the handle of the watch in the water or when the watch is wet to prevent water from entering the watch. Do not leave the watch in a high temperature (60 ° C) and low temperature (-10 ° C) environment for a long time. NOTE!!! Please keep the watch away from magnets which may damage the movement Waterproof rubber rings are prone to aging and deterioration, and should be replaced regularly.Damage to the watch glass can affect the waterproof performance of the watch, and it should be replaced in time if it breaks. Do not operate the handle of the watch in the water or when the watch is wet to prevent water from entering the watch. Do not leave the watch in a high temperature (60 ° C) and low temperature (-10 ° C) environment for a long time.