36mm Case with Swiss Movement Welly merck uses only the world's leading movement manufacturer Ronda in Switzerland. You will enjoy the precise time as you wish.Case size 36mm,thickness 6.9mm A small subdial dial for second At 6 o'clock,there is a small subdial,that is to read second time.To satisfied those who like watch with a second hand. 50M Water Resistant Water resistant up to 50 meters(164feet),Suitable for everyday use.Please DONOT wear this watch when diving. Also avoid the use in hot or extreme cold temperature.It can wear when swimming,but too much water contact will shorter watch life. Read more Sapphire Crystal Sapphire crystal more expensive than other glass,material and the most scratch resistant.It's very hard, durable, transparent material made of crystallizing aluminum oxide at very high temperatures. The strap with fast release bar The fast release bar make the strap interchangeable.Innovative interchangeable strap that can change the strap in just a few seconds without a tool. Innovative clasp buckle design Welly Merck mesh strap has a locking mechanism that allows you to adjust the strap to fit your wrist size. Amazing, no tools are required to do the adjustment. Just slide the strap until it fits properly and locks the mechanism. Read more Read more