Use the RTAKO smartwatch to check your physical condition from exercise, sleep, heart rate, blood oxygen, fatigue, and so on. Understand your health condition through data analysis! Compatible system: iOS 9.0 and Android 4.4 or above (smartphone only, not for PC, iPad, or tablet). App: Download the APP named "Smart Wristband3" by scanning the QR code of the manul. Fitness Tracker & Connected GPS Track your exercise data with 16 different sports modes. Automatically measures the number of steps, calories & distance.