Protection level usually refers to the waterproof level of outdoor connectors, waterproof connectors are an important choice for outdoor intelligent equipment; When the connector works in dust, rain and other environments, it must at least meet the requirements of IP65 protection level, and if it is immersed in water or in contact with high temperature and high pressure water, it needs to meet the higher protection level. Only by selecting the corresponding protection level, the connector will not fail in the high temperature and high humidity environment, and the equipment will not short-circuit, burn out, etc., and such outdoor connectors are usually used in plant protection machines, underwater drones, industrial robot dogs, outdoor LED displays and other application scenarios.