Amazfit T-Rex Pro Smart Watch: Rugged Outdoor GPS Fitness Watch - 15 Military Standard Certified - 100+ Sports Modes - 10 ATM Water-Resistant - 18 Day Battery Life - Blood Oxygen Monitor, Desert Grey - Walmart.com
Amazon.com: Garmin Enduro, Ultraperformance Multisport GPS Watch with Solar Charging Capabilities, Battery Life Up to 80 Hours in GPS Mode, Steel with Gray UltraFit Nylon Band : Electronics