Do you know what LED Solar Road Studs IP65 rating means?

Do you know what LED Solar Road Studs IP65 rating means?
What does Solar Road Studs IP65 mean?
Solar Road Studs dustproof rating (the first I indicates)

0: no protection
1: Prevent the intrusion of large solids
2: Prevent the intrusion of medium-sized solids
3: Prevent small solids from entering
4: Prevent objects larger than 1mm from entering
5: Prevent harmful dust accumulation
6: Completely prevent dust from entering
Solar Road Studs waterproof rating (the second P indicates)

0: no protection
1: Water droplets dripping into the shell have no effect
2: When the shell is tilted to 15 degrees, water droplets dripping into the shell has no effect
3: Water or rain has no effect on the shell from a 60-degree corner
4: The liquid splashed to the shell from any direction has no damage effect
5: Rinse with water without any harm

6: Can be used in the environment in the cabin
7: Can be immersed in water in a short time (1m)
8: Soak in water for a long time under certain pressure
So IP65 means Solar Road Studs completely prevent dust from entering, rinse with water without any harm.