Multifunction Magic Smart NFC Ring for Android WP Mobile Phones Samsung Galaxy S4 S5 NOKIA HTC LG APP Lock Business Card Black Size 11# Compatible with all Android and Windows phones with NFC function; Good waterproof performance, suitable for any people at any time; The intelligent magic ring is a Wearable electronic components, operate the mobile function and share the data by NFC wireless frequency communication technology; Created by the pure medical titanium, no need for any external power energy; Main functions:1.APP / Program lock,2.Magic business card,3.Internet link sharing,4.Online file sharing,5.Start to hide,6.Automatic operation.