NFC intelligent nail sticker is a high-tech smart product. Function is very simple, as long as you are using a mobile phone with NFC functionality, nails will shine. NFC intelligent nail stickers embedded smart LED light source, the use of mobile near-field communications technology (NFC), no battery inside nail stickers. In addition to mobile phones, the use of any electronic device can be as effective as NFC functionality (access control, public transportation card swipe machines, etc.). Most recent Android phones have NFC capabilities. Check to see if it's available in your phone by going into settings and look for NFC. The NFC hardware is usually located on the back side of the phone. Owners Please Read: These stickers will most likely NOT WORK with your phone. Even though the iPhones have NFC capabilities, Apple does not allow users to turn on the NFC setting. Specification: Marerial: FPC material Size: 1.1x0.7cm Package Includes: 2pcs Nail Tips Note: Transition: 1cm=10mm=0.39inch Please allow slightly 0-1cm difference due to manual measurement. Colors can appear different depending on light and how the listing is viewed. Thanks for your understanding and attention. Wish you a pleasant shopping experience!