Feature:1. 20Pcs Stickers: The package includes 20pcs NFC sticker, 40mm/1.57in diameter, 13.56 MHz operating frequency, 05cm/02in reading distance.2. Multipurpose: NFC stickers has multiple uses, suitable for smart phones and tablets, access control devices, etc. Making life more convenient.3. Anti Interference: The anti jamming algorithm selects each tag individually and ensures that the selected tag executes the transaction correctly. Allows multiple tags to work on site at the same time.4. Easy to Operate: NFC sticker is lightweight and compact, can be more easily embedded in objects such as product labels or electronic devices.5. Small Size: Mobile NFC stickers are small and can be attached to the back of your phone or other devices without affecting performance.Specification:Item Type: NFC StickersMaterial: PETOperating Frequency: 13.56 MHzReading Distance: Approx. 0-5cm/0-2inWorking Mode: Read and WriteDiameter: Approx. 40mm/1.57in.Package List:20 x NFC Stickers