The Chargerless Ray tracks the following health metrics around the clock:
- Heart rate — continuous optical heart rate monitoring
- Heart rate variability (HRV) — a key indicator of stress and recovery
- Sleep stages — light, deep, and REM sleep tracking
- Body temperature — skin temperature trends over time
- Steps — daily step counting and activity tracking
- Light exposure — how much sunlight you're getting each day
All data syncs wirelessly to the Chargerless companion app (iOS & Android) where you can view trends, set goals, and get insights.