Amazon.com : POLAR VANTAGE V – Premium GPS Multisport Watch for Multisport & Triathlon Training (Heart Rate Monitor, Running Power, Waterproof), Standard Edition, Black : Sports & Outdoors
Amazon.com: Amazfit Bip U Pro Smart Watch with Alexa Built-In for Men Women, GPS Fitness Tracker with 60+ Sport Modes, Blood Oxygen Heart Rate Sleep Monitor, 5 ATM Water Resistant, for iPhone