This Fitness Activity Watch features a 0.94-inch color OLED display that keeps track of the all of the vital health and fitness metrics you should watch on a daily basis. The activity tracker monitors heart rate, blood pressure and blood oxygen, as well as includes a calorie counter and sleep quality monitor. It’s compatible with Bluetooth-enabled smartphones, and features a pedometer and stopwatch, as well as calendar, text message and call notifications. It’s light and comfortable and works for four days on a full charge.