All Day, Every DayConquer every hour with advanced training features, 24/7 health and wellness monitoring, and up to more than a month of battery life with the Power Sapphire solar charging lens and a rugged watch case designed to endure.Be Your Best. Know You're Best.Long Battery Life With Solar ChargingGet up to 37 days in smartwatch mode with solar charging in 3 hours of direct sunlight (50,000 lux) per day and up to 122 hours in GPS mode with solar charging (assumes continuous use for entire period in 50,000 lux conditions).Built-In LED FlashlightVariable light intensities and a red safety light give you greater awareness while you train in the dark and can provide convenient illumination when you need it. Strobe mode can even match your running cadence.Hill ScoreThis feature measures your capability for running uphill and evaluates your progress over time based on your VO2 max and training history. It measures your running strength on steep ascents and running endurance on long ascents and provides a score based on your performance over time.Endurance ScoreThis feature measures your ability to sustain prolonged efforts and combines training data from all your athletic pursuits to help you understand how training impacts your overall endurance. This dynamic measurement uses your VO2 max, short-term/long-term training loads and other factors to gauge your fitness progress beyond just VO2 max.Rugged By DesignThe resilient athletic design features a 1.4" scratch-resistant sapphire solar charged display, responsive touchscreen, traditional buttons and 51mm fiber-reinforced polymer case with a titanium bezel and rear cover. The watch is tested to U.S. military standards for thermal, shock and water resistance.Knowledge is PowerYour health and training data should be easy to interpret and provide actionable insight. Begin each day with a customizable morning report, and see a daily summary of health and wellness information. Use the training readiness feature - which looks at a variety of different health metrics to help you maximize your training efficiency and recovery - to prevent burnout.Conquer The Day, One Hour at a Time - Performance FeaturesVisual Race PredictorGet an estimate of what your pace could be for a 5K, 10K, half-marathon and marathon.PacePro TechnologyPlan race-day strategy with GPS-based pace guidance for a selected course or distance.ClimbPro FeatureSee real-time information on your current and upcoming climbs on downloaded courses.Grade-Adjusted PaceGet your equivalent running pace at the same effort on flat ground or when ascending.Training ReadinessFrom the moment you wake up, get a readiness score based on your sleep quality, recovery, training load and more, so you can determine whether it's a good day to go hard - or take it easy.Training StatusGet insight, and know whether you're training productively, peaking or...