1. MTK6580 Quad Core 1.0GHz CPU, Android 5.1 operation system, 2GB + 16GB memory. 2. Can record steps, calories, and distance. Let you know your sports data, adjust your exercise program and get a healthier life! 3. Heart rate monitor: When you monitor the heart rate, you need to keep the watch touch your skin, it can read your heart rate more accurately. 4. Compatible with iOS & Android phones. 5. With network, support GSM /WCDMA, GSM 850/900/1800/1900, WCDMA 850/2100. 6. Built-in GPS and fitness apps keep you going. Even without your phone, you will never miss your way. You're able to track your progress when running, driving, biking, playing golf etc. 7. 1.39-inch single touch screen, 400*400 pixel AMOLED screen. 8. Functions: Clock mode, personal UI, pedometer, notification reminder, ring, weather, OTA upgrade, message, Bluetooth.