Get weeks of battery life with the Power Glass solar charging lens. Meet any challenge with advanced training features such as hill score, which measures your climbing performance over time, and real-time stamina updates to gauge your stamina potential. For a more complete picture of your health, training and recovery, tap in to 24/7 health and wellness monitoring with advanced sleep tracking, HRV status, Pulse Ox and more (this is not a medical device, and data presented is intended to be a close estimation of metrics tracked; Pulse Ox not available in all countries).