Water resistance of the watches (holding capacity in the product description):
Below 3 atm: Not waterproof.
3 atm: Withstands occasional splashes such as rain. Do not immerse in water.
5 atm: Limited waterproof watch. It can withstand showering and, in principle, swimming in surface water as well. However, the watch is not designed with water in mind, so getting it wet is not recommended.
10 atm: Waterproof watch. Withstands swimming and snorkeling in surface water.
20 atm: A special waterproof watch that can withstand even scuba diving.
30 atm: Special waterproof watch. Suitable for professional diving use/deep diving.