It is a rechargeable waterproof lap counter that does not use a waterproof bag separately. Now the weather here is very hot because it is summer. I went to the pool with my primary school son to avoid the heat, and I saw people swimming several times on the swimming track. How many laps did they turn? When you learn to swim, count how many turns you have made to measure your momentum. But most people forget the count. There is a wrist watch or a finger counter, but it is a little uncomfortable when swimming. When swimming, it is better not to do anything. I made an intuitively waterproof lap-counter. Simply press it to go up once. I would like to implement many functions, but step by step.”

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