The COROS VERTIX 2S builds on the brand's flagship watch, offering incredibly long battery life, pinpoint GPS accuracy, durability, and all of the features that users love about the previous VERTIX 2. This hardware upgrade includes their most accurate wrist-based heart rate sensor, 118 hours of continuous GPS battery with 48 days of Daily Use, and innovative new software that gives COROS users unmatched GPS accuracy for outdoor climbing.