Multi-function Activity Tracker Colorful Screen,Timer , Mileage, Calories Counter, Sleep Monitor,Physiological Cycle Reminders, Sedentary Reminder, Call SNS SMS Alert, Camera Remote Control, Alarm Clock, Countdown, Stopwatch, Find Phone, Time Display, Touch Key..Heart Rate Monitoring Automatically tracks your real-time heart rate throughout the entire by the latest HR sensor. Fine hairs on arm and sweat affect the accuracy of heart rate. Keeping dry and wearing tighter can reduce errors..Fashion Design & Replaceable Bands Sport King fitness watch with 0.96” OLED Colorful display screen. Slim, comfortable and easy to wear. Replaceable strap made from durable and waterproof materials, easy to install and remove.You will barely feel like you have anything on your wrist at all..Wide Compatibillity The app supports most smart phones with Bluetooth 4.0. Support system: iOS 8.0 or above (iPhone SE, iPhone 5/5S/5C, iPhone 6/6S plus, iPhone 7/7S plus, etc.), Android 4.4 or above(Samsung Galaxy S8, S7/S7 Edge,etc )..NOTE Please read the instructions carefully before use. If you have any questions, please contact our customer service. We offer 1 year warranty.