IP is the international code used to identify the Ip level of protection by the two figures formed, the first number indicates dust; second number from the said water, said its protection, and the larger the number the better leader. No definition of class level of dust protection unprotected 0 1 no special protection against objects larger than 50mm of invasive light touch to prevent inadvertent exposure to internal parts of the body to prevent the invasion of a diameter greater than 50mm 2, the object to prevent the invasion of more than 12mm to prevent the fingers 3 lamp touch the internal parts to prevent the whole thing is greater than 2.5mm diameter greater than 2.5mm intrusion prevention tools, wires or objects greater than 1.0mm to prevent the intrusion of the object 4 to prevent invasion of mosquitoes diameter greater than 1.0, invasive insects or objects 5 can not completely prevent dust intrusion dust, but the intrusion of dust will not affect the amount of light dust to completely prevent the normal operation of the dust penetrated 6