Amazfit Bip is resistant to dust, rain, splashing, and accidental submersion. It shouldn’t be used when you are taking a shower/bath, having a spa, swimming or in the sauna or steam room.
When you move your arm to begin swimming, water pressure can change quickly. It would be much higher than the static pressure at the depth of 1.5 meters and it’s possible water could force its way into the device.
When you are taking a shower/bath, rapid changes in temperature may cause expansion and contraction damaging the watch and its water-resistance rating. Shampoo, soaps and other liquids are highly corrosive to the wristband and the casing of the watch.