Amazfit
Amazfit Helio Ring Size 12, Smart Ring with Sleep Monitoring, Heart Rate Monitoring, 10 ATM Water-Resistance - 3,82g Ultra Lightweight Fitness Tracker up to 4 Days Battery Life
RingConn
RingConn Smart Ring, No App Subscription, Size First with Sizing Kit, 7-Day Battery Life Activity & Sleep Tracker/Stress/Heart Rate Monitor, Waterproof Compatible with iOS & Android(Gold, Size 10)
findtime
Smart Ring Fitness Tracker for Men Women Fitness Ring Pedometer with Heart Rate Blood Oxygen Sleep Monitor Activity Trackers for Sports Time, Distance, Calories Compatible with Android iOS,Black#12