Smart rings are electronic wearable devices worn on the finger. It works through movement of the fingers and gesture control. The smart rings are equipped with sensors and chips which enables it to perform various functions such as receiving call, message and email alerts, making contactless payments, measuring blood pressure levels, pulse rates and heart beats and it also provides biometric solutions by monitoring access controls among others.

http://www.military-technologies.net/2017/11/...2017-2025/

It is happening all around us it is just a matter of time and this should get some traction..