Narbis Edge electrochromic smart glasses with ear clip heart rate sensor. HRV biofeedback built in — train coherence, focus, and calm in just 10 minutes a day. No subscription required for HRV training.
- Electrochromic lenses respond in real time
- Ear clip PPG sensor for heart rate variability
- Companion app included (iOS/Android)
- Ships in 30–60 days (currently on backorder)