Coros Watch Apex 2 Pro Premium Multisport Grey CO-782173. Designed for performance over all types of terrain, the APEX 2 and APEX 2 Pro GPS. Outdoor Watches are built with revolutionary technologies for your most ambitious goals. With an even more durable exterior, redesigned GPS antenna for stronger performance, enhanced navigation experience, next generation optical heart rate sensor, and longer GPS battery life, the APEX 2 and APEX 2 Pro watches are the most powerful wrist worn tools to guide your training and track your movements across the wilderness. Get ready to train smarter and go longer.