Term of the Moment
Ethereum 2.0
Definition: smart ring
A health and fitness tracker finger ring. Smart rings perform several of the functions of a smartwatch such as heart rate, sleep tracking and blood oxygen level (SpO2). Activities are sent to a smartphone. See fitness tracker.
The Oura Ring
Launched in 2013, the Oura smart ring connects to iOS and Android phones via Bluetooth. Users must have a subscription to use all its features. (Image courtesy of Oura Health Oy.)