The IP68 rating mentioned in the product description indicates that the Geekvape S100 mod is dust-tight and water-resistant. The "6" in the rating means that the device is completely dust-tight, and the "8" means that it can be immersed in water for a specified amount of time (usually 30 minutes to 1 hour) at a specified depth (usually 1 meter to 3 meters) without any water ingress.