Cryfokt
Health Fitness Tracker Smart Ring, Aluminum Alloy Ceramic NFC Ring with Heart Rate Monitor/Sleep Monitor/Body Temperature/Blood Oxygen, Activity Tracker Bracelet for Men or Women (17#)
Zudoo
Smart Ring Health Tracker, BT Sleep and Fitness Ring - Tracks Heart Rate Monitor, Sleep Monitor, Body Temperature, Pedometer, Blood Oxygen, Rechargeable Waterproof Health Ring (Black No. 17)
Zudoo
Fitness Smart Ring, Activity Health Tracker for Heart Rate Monitor, Sleep, Pedometer, Body Temperature, Blood Oxygen, Rechargeable Health Ring with APP, Bluetooth, IPX8
WHOOP
WHOOP 4.0 Wearable Health, Fitness & Activity Tracker Continuous Monitoring, Performance Optimization, Heart Rate Tracking Improve Sleep, Strain, Recovery, Wellness (Onyx)