Features GOOD PERFORMANCE: NFC RFID sticker tag is with 504 bytes memory design, with read and write lock function. Good performance. This set contains 50pcs tags and enough for daily working use. SECURITY AND AUTHENTICATION: NFC RFID sticker tag label typically used for contact information, such as providing your contact information or business information, and for security and authentication purposes. STRONG WATERPROOF FUNCTION: RFID sticker tag adopts strong waterproof function, not easy to wear, anti corrosion, high durability. HUNG ON KEYCHAIN AVAILABLE: NFC RFID sticker label is small and delicate appearance, can be hung on the key chain, easy to carry. WIDE APPLICATION: NFC sticker label is suitable for access control, hotel doors lock, staff attendance and campus access control and payment control and so on. Spec: Item Type: UID Sticker Label Material: Copper Alloy Operating Frequency: 13.56MHZ Detection Distance: 0-10 Cm (Depending On Reader) Working Temperature: -20 - 55℃, 90% Humidity Rewriting Times: More Than 100000 Times Data Storage: More Than 10 Years Reading Time: 100000 Times Diameter: Approx. 25mm / 1in How to Use: Direct to use. PackageList: 50 x NFC RFID Sticker Tag Label Notice: This NFC sticker is not suitable for iphone. Package List 50 x NFC RFID Sticker Tag Label