Watch faces are continuously updated at the APP to meet diversified aesthetics. Customize the Haylou GST's watch face with your favorite picture.Weighing only 38g, Haylou GS offers extra wearing comfort and assists your workout with no limits.Support 12 workout modes, covering indoor and outdoor workouts. A high-precision motion sensor can accurately record workout data.IP68 rated dust and water resistant. It can easily cope with sweat and rain storms — no need to take off the watch even when washing hands.Excessive physical and mental exertion will lead to low blood oxygen levels. Haylou GS supports SpO2 tracking anytime, helping you adjust your status in time.Haylou GS can perform 24-hour heart rate monitoring. You can check recent heart rate data through the APP on your phone.A full charge lasts for more than a week under daily usage mode. Enjoy wireless freedom and a worry-free business trip.You don't need to set sleep monitoring manually. Haylou GS automatically recognizes your sleep status and records sleep duration and depth data to help you develop good sleep habits.