APEX 42mm Ultra-Durable Battery Life Make constantly charging your watch a thing of the past. With APEX, you will have a watch that is built to last above and beyond your workout. In UltraMax setting, the battery is carefully engineered to last up to 100 hours using GPS. While using normal mode will yield up to 35 hours, and regular usage up to 30 days. Built in Premium Transitioning from the workplace to training is easy with the APEX's intelligent build and design. With finish options including titanium alloy and stainless steel bezel alongside a sapphire glass face for extreme protection, you are prepared for any and every environment. Simplicity at its Finest Changing screens and using devices can be overwhelming with traditional buttons, especially in the middle of a workout. With the digital knob, you can easily navigate through the APEX, allowing you to focus on the important things like finishing your run or prepping your next set. Training Efficiency Without Injury To prevent injury, there’s nothing more crucial than training correctly. We’re able to accurately determine your overall effort, broken down into stamina level (0-100) and training effect (0-6). Exerted way too much stamina? COROS Trainer will notify you it’s time to rest up. Based on the effort level and training history, you will then be able to see an advised recovery window before you begin your next activity. Navigation Track Equipped with track and navigation features, APEX can be your best tool when you need directions the most. Routes are uploaded and displayed on grid as a bread crumb trail with real time information on heading and elevation and alerts to help you get back on course.