RFID on metal tag (Anti-metal RFID tag) is hard plastic material encapulate with rfid chip and  put ferrite material or anti-metal layer backside for normal working on metal  surface or battery position .  With experience for this kind of rfid tags , it can get good reading distance and working performance after we attached ferrite or anti-metal layer backside ,because matal or battery can active protective screen and block rfid signal working normal , that is why we have to put anti-metal material for good working under metallic environment .

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