Water resistance is not a permanent condition and may decrease over time, avoid using the Fujitsu ARROWS NX9 in saunas, steam baths, drop it or receive blows, expose it to soap or shampoo, expose it to perfumes, solvents, detergents, acids, creams and in general any type of liquid other than fresh water and extreme temperatures. The ARROWS NX9 has a certification IP65, IP68.