This smart ring gives you instant mobile payments with beefed up security

Token, a new smart ring, promises to give its wearers a chance to make mobile payments, unlock doors, and ditch their passwords — all while protecting their identity with an extra level of security.   The wearable uses the same type of near field communication (NFC) technology found in credit cards and hotel keys to make purchases, and Bluetooth — along with a wake gesture, like knocking — to log into computers, lock car doors and more.