Dustproof grade (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

Waterproof grade (the second P indicates)
0: no protection
1: Water droplets dripping into the shell has 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