I prefer to diving or snorkel around the sea shore in Krabi,Thailand with my buddy. And this the fist watch for helping me to setting the time we were left. How can you need to have the timepiece to safe your life under the water? The Oxygen in your tank has limit time to use, and this is the understate (cheap watch) time piece I have not seen before. Movement smooth and quiet, easy to find the time you can not lose by luminous and water resistance to 200 meters. Suitable for my wrist that OK.