Oppo is a Chinese company that makes smartphones, smartwatches and fitness bands. Its wearables monitor activity, sleep and cardiovascular signals while providing notifications. Some models add temperature sensing, electrocardiograms and short multi-metric wellness checks.

How it works
Optical sensors use light to estimate pulse and blood oxygen from wrist blood flow. Motion sensors track activity and sleep, while satellites map outdoor exercise. On compatible watches, electrical contacts record a brief electrocardiogram through touch. Oppo software turns these signals into sleep stages, stress estimates, workout summaries and alerts.

Key considerations
Health features vary by model, country and regulatory approval. Regulated functions may be unavailable for some users. Fit, movement, tattoos, skin contact and cold conditions can affect wrist readings.