Most watches use optical sensors (PPG) that measure blood flow through the skin. For medical-grade precision during intense workouts, some advanced models also offer ECG/EKG sensors to detect irregular rhythms like AFib
This varies widely. Performance watches like the Garmin Forerunner 265 Go to product viewer dialog for this item. buy heart rate monitor watch
Built-in GPS allows you to track your outdoor running or cycling routes accurately without needing to carry a phone. Most watches use optical sensors (PPG) that measure