The HONOR Watch GS Pro is complied with 14 different MIL-STD-810G tests, including temperature-humidity-altitude resistance, salt spray, sand resistance and humidity resistance, enabling it to withstand extreme conditions.HONOR Watch GS Pro is complied with 14 types of MIL-STD-810G tests, including Low Pressure (Altitude), High Temperature, Low Temperature, Temperature Shock, Contamination by Fluids, Solar Radiation. HONOR Watch GS Pro can endure up to 25 days. Even with the outdoor GPS mode on, it's still good for up to 100 hours3. Adventurers don't need to worry about running out of battery anymore when exploring the wild. The high-precision built-in dual satellite navigation systems enable Route Back to help track your way back, even when taking the road less travelled.