1.long life 2.dust-proof & oil-proof 3.good cushion,shock absorption effect 4.CCC,CE certificate 1.Long life:Adopt high-efficiency spring structure design,machine life more than 10,000,000operation2.The structure design of dust-proof and oil-proof: 1)Switch body adopt compressed sealed rubber rings and diaphragms,it will keep IP64 class. 2)Can be customized terminal part of epoxy resin to seal ...