fitness, heart rate & sleep tracker: the amazfit gts fitness smartwatch precise optical heart rate monitoring allows you to accurately track real-time steps taken, all-day heart rate monitoring, distance traveled, calories burned, quality of sleep and sleeping patterns 1.65" amoled always-on display: amazfit gts has a customized 1.65-inch amoled always-on stylish square screen which offers a larger display area than a round watch face of the same width, so it can carry more information 14-days battery life: our smartwatch deeply optimizes the power consumption of the components to bring long-lasting endurance of 14 days while keeping a slim watch body, which enables you to avoid frequent charges bluetooth music control: bluetooth music control allows you to directly control music from your gts smartwatch while workout without having to pull out your phone.strap material:silicone 5 atm water resistant: amazfit gts is water resistant to a depth of 50 meters and supports multiple swimming scenarios. it can automatically recognize your swimming position, and record data like swolf, pace or calorie consumption