Garmin Instinct 2 Solar, GPS Outdoor Watch, Solar Charging Capabilities, Multi-GNSS Support, Tracbak Routing, Graphite

Go longer than ever with solar charging that gives you unlimited battery life in smartwatch mode (assuming all-day wear with 3 hours per day outside in 50,000 lux conditions)
Battery life: in smartwatch mode, unlimited with solar charging in 3 hours of direct sunlight (50,000 lux) per day; in GPS mode, up to 48 hours with solar charging continuously in direct sunlight (50,000 lux)
Built-in sports apps to take on running, biking, swimming, strength training and more; plus, VO2 Max and other training features