Amazfit GTR Smartwatch, Classic Design, 24/7 Heart Rate Monitor, Music Control, GPS, 10-Day Battery Life, 12-Sport Modes, Water Resistant, Starry Black (W1910US1N) : Everything Else - Amazon.com
Amazon.com: Amazfit GTR Mini Smart Watch for Men,14-Day Battery Life, Sports Watch with GPS, 5 Satellite Positioning Systems, Fitness Health Tracker with Heart Rate, SPO₂ Monitoring,5 ATM Water Resistance, Blue : Electronics