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Welcome to our intelligent inspection management system, you will personally appreciate this product to your convenience in future use. ZK-500 military-level design, super strong, waterproof, anti-fall, T6061 aviation aluminum shell imported 3MM thickness, military III hard anodized. Super strong shell, liner made of environmentally friendly electronic filling silicone, triple protection, anti-fall of up to one hundred meters fall without injury, the whole fixed all the elements and plates no screws, compatibility, and can be read on the market, domestic , import all of 125K frequency tags, arranged in the inspection line, no power, no wiring.