Cheap And Discounts 1Pc/Lot NFC 13.56Mhz MF 4K S70 UID 7Bytes Rewritable Changeable Keytag Card Wholesale. Buy Directly From Merchant Shenzhen Lanhong technology company. Enjoy ✓Free Shipping Worldwide! ✓90 Days Buyer Protection. ✓Easy Return. ✓Money Back Guarantee.