1、20Pcs Stickers: The package includes 20pcs NFC sticker, round, 40mm/1.57in diameter, 125KHz operating frequency, 0‑5cm/0‑2in reading distance. 2、Multipurpose: NFC stickers can be used for access control, home assistant, door lock, business card etc., make your work and life easier. 3、Anti Interference: The anti jamming algorithm selects each tag individually and ensures that the selected tag executes the transaction correctly and is not disturbed by the presence of another label on site. 4、Simple to Operate: NFC sticker can be more easily embedded in objects such as product labels or electronic devices for your daily use. 5、Compact Size: The phone NFC sticker is small in size and can be attached to the back of the phone or other devices without compromising performance.