P68 is the highest level of dust and water resistance standard in GB / T 4208-2017 enclosure protection level (IP code). To evaluate the solid proof and waterproof performance of the shell, the following two digits XX of ipxx are mainly considered. The first X is the dustproof grade from 0 to 6, and the highest level is 6; the second X is the waterproof grade from 0 to 8, the highest level is 8; the highest protection level is IP68.