BOSS Watch HB1512426 Case material: stainless steel 316L stainless steel is a highly durable and virtually indestructible material. It is hard (it won't bend or break), colorfast, hypoallergenic (it doesn't react with bodily fluids, so no metallic components are released into the skin or body), and has a corrosion-resistant surface (it resists oxidation and corrosion, and is also resistant to both fresh and salt water). Power supply: battery The watch is battery-powered. Strap material: leather Leather is one of the most popular materials used to make watch straps. It looks elegant, doesn't get cold, and is very easy to adjust to the wrist. date stamp The clock displays the current date. Waterproofing: 30M/3ATM Watches marked with 30M/3ATM water resistance are intended for accidental contact with water (car washing, rain). 30M/3ATM indicates the level of water resistance standardized by ISO 2281. ISO testing includes alternating temperatures, depths, and pressures (water, air) over various periods of time, both at rest and while operating the watch's functions. Crystal: mineral Currently, it is the most common type of watch crystal. It is very hard and has a high silicon content, making it highly resistant to scratches and abrasion.