... airtight, waterproof, dustproofIn the normal, switch lifespan can reach 10,0000 cycles Certification:RoHS compliance Why choose ... sizable order.Packaging: as to complicated products, we can special design based on your packing requirement.1). ... ball sensor/ Mercury switchesFinish Nickel-plated, silver-plated, gold-plated, imitation gold-plated according to customers requestAdvantage High quality, ...