IP67 stands for Ingress Protection against dust and water. The "6" rating indicates the highest protection against dust (such as windblown dirt and airborne particles) while the "7" indicates the unit can withstand waterhose and jet sprays as well as temporary submersion up to 1 meter depth for up to 30 minutes. So rain and river trips = no problem.Care Tip: if your unit gets wet, wait for it to try before charging. If you see dust in/around your USB-C port, blow on it before charging to help clear any debris.