Feature: Anti Metal type, fit for paste on Metal material, for example, Phone or computer or others. Compatiability: Support 13.56mhz RFID and NFC IC reader/writer, For example:Acr122u reader/writer. Support Smart mobile phones with NFC function. for An-driod system Phone could download the NFC software, such as the for Goo-gle play NFC Task Launcher, NFC ReTag Pro Security Software. Application: Check in, mobile payment, product information query, mobile identification, mobile marketing, social networking, business card sharing, access control, membership management, posters, healthcare,book borrowing etc. Specifications: Item Type: Anti Metal Sticker Material: sticker Size: diameter: app.25mm/0.9in Color: Black Chip: Ntag213 Diameter: 25mm Usable capacity: 144 bytes Protocol: ISO14443A Frequency: 13.56 MHZ Read Distance: 1-5cm(depend on the card reader) Read and Write Time: 1-2mS Erase times: greater than 100000 times Data storage: greater than 10 years Quantity: 6 PCS Note: No retail package. Transition: 1cm=10mm=0.39inch Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Includes: 6 x Anti Metal Sticker