Smart rings can connect to smartphones or other devices, and some can operate independently, communicating with cloud computing systems or performing standalone tasks. Although many are displayless, they respond to contextual cues, such as gesture controls or proximity to NFC touchpoints,[1] and can give haptic feedback.
Health
Use cases for smart rings are varied, and comparable to those of smartwatches.
Many smart rings have sensors to track health metrics[2][3] such as steps, heart rate,[4] temperature, sleep (through heart and motion sensing), and blood flow.[5] Due to size constraints, smart rings typically include smaller and less accurate accelerometers, and smaller batteries, than smartwatches.[6]
Smart rings were first used for secure access control, such as for company entry and exit, home access, cars, and electronic devices.[citation needed] They may be considered more difficult to lose, since they are worn directly on the hand. They can include two-factor authentication mechanisms such as biometrics and key code entry.[citation needed]
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