SAVFY Fitness Tracker, Heart Rate Monitors Bluetooth 4.0 Smart Braclet with Activity Tracker for iPhone Android Smartphone, Black HEART RATE MONITOR - Design with built-in sensors, tracking and reminding the data during every sport moment, help you arrange exercise time and intensity freely. MULTI-FUNCTIONS - Heart rate monitor, Step pedometer, Calorie burnt, Distance track, Sleep monitor, Call Remind, Alarm remind, Anti-lost, Camera remote control. SMART WATCH - 0.49 inch OLED screen with Bluetooth 4.0, Lightweight and flexible waterproof band that is easy and comfortable to wear, a good gift sports fitness COMPATIBILITY - Android smart phones with Bluetooth 4.0 and Android 4.4 or iOS 7.1 and above, iPhone 5/5C/5S/6/6 Plus 6S/6S Plus, iPad, iPod touch etc; Not compatible with the iphone 4/4S KINDLY Note: The Step pedometer function will record data when your steps reach to 30 or more. The tracker is only life waterproof (sweat proof, rain proof, water drop proof), not for shower and swimming