Your Withings Steel HR can withstand a pressure similar to that of a 50 m (165 ft) depth. You can, therefore, use it when dishwashing, splashing or swimming. however, it can't be used for diving or snorkeling.
Do not press the button of your Withings Steel HR when it is under water.
Avoid long exposure to salt water. Make sure you rinse your watch with fresh water after spending time swimming in salted water.
Avoid exposure to any chemical products such as solvents, detergents, perfumes or cosmetics. They may damage the wristband, the casing of the watch, or the HR sensor.
Avoid extreme atmospheres (e.g., saunas or steam rooms)
The aging of the materials may affect the waterproofness of the watch. Water resistance cannot be permanently guaranteed.