Garmin Fenix 7 Pro Sapphire Solar Conquer 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 lens1 and a rugged watch case designed to endure. Get up to 22 days in smartwatch mode with solar charging in 3 hours of direct sunlight (50,000 lux) per day and up to 73 hours in GPS mode with solar charging (assumes continuous use for entire period in 50,000 lux conditions). Variable 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. This 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.