What does heart rate monitor do & how does it work on smart watch?
Monitor your heart rate with Apple Watch - Apple Support
Satın alın 1.28 Inches Full Touch Screen Smart Watch Women Men Sport Heart Rate Blood Pressure Fitness Tracker Waterproof Round Smartwatch For IOS Android | Joom
Bluetooth Smart Watch Heart Rate Health Blood Pressure Monitor Fitness Tracker | Fruugo TR
Amazon.com: CHOKOVIE Smart Watch, Fitness Tracker with Heart Rate Monitor, Blood Oxygen Meter, Body Temperature Thermometer, Sleep Tracking, IP67 Waterproof, Step Counter Running Watch for Men Women, Black : Electronics