One of the main features of the smart ring is to serve as a near-field communication device, effectively eliminating the need to carry credit cards, door keys, car keys, and potentially even ID cards or driver's licenses.[3][4] Other uses include connection to a smartphone in order to notify the user of incoming calls, text, emails, and more; use as gesture-based controller, allowing the user to perform a variety of actions with a simple motion of the hand; and measure steps, distance, sleep, heart rate, and track how many calories the user consumes.[5][6]