2-week Battery Life Sapphire Glass, Titanium Body Golf & Skiing & Swimming (5 ATM), 100+ Workout Modes One More Navigator to Lead You Back The Route Back feature records your travel route and uses GPS for more accurate position-marking. When GPS signal is too weak, it sends out alerts. Under this circumstance, you can still use the recorded travel route to real-time checking and find your way back. Supporting precise data tracking for 100+ workout modes, such as climbing, outdoor running, rowing, surfing, tennis, etc., the smart watch helps track all the way you move. Moreover, there are more than 10 running courses with throughout voice guidance3 to give you more suggestions for better training. VO2Max4 VO2max is the maximum rate of oxygen consumption measured during incremental exercise. VO2max consumption reflects cardiorespiratory fitness and endurance capacity in exercise performance.