Fitbit Sense 2 Smart watch, NFC, GPS (satellite), AMOLED, Touchscreen,
What does heart rate monitor do & how does it work on smart watch?
Bluetooth Smart and ANT+ Heart Rate Monitor - Myithlete
Amazon.com : Pyle Smart Fitness Heart Rate Monitor - Digital Sports Wrist Watch Activity HR Tracker w/ Chest Strap, 3D Sensor, EL Backlight, Alarm, Used in Exercise or Running, For Men and
Amazon.com: Smart Watch for Men Women - Oximeter (SpO2) Calorie Pedometer, Sleep and Heart Rate Monitor, 24 Sports Modes 1.47 Inch HD Screen, iP68 Waterproof, Compatible with Android and iOS Phones (2
YAMAY YM021 Smart Watch for Android Samsung iPhone, Fitness Tracker Watches with Heart Rate Monitor, Square Touch Screen, Waterproof Smart Watches for Women Men, Gray - Walmart.com