Fitness Tracker, YAMAY&reg; Activity Tracker with Heart Rate Monitor Waterproof Pedometer Watch Bracelet for Android iPhone Women Men Calories Burned Sleep Monitor Text Notification for Swimming Walking Main Function: Tracking Heart Rate, Pedometer, Distance, Calorie, Sleeping Monitor, Sedentary Remind, Calling Notification, Facebook/ Twitter/ SMS Alert, Alarm. Built in Heart Rate Monitor, calculate heart rate accurately by PPG sensor all day Waterproof IP67, means that it can be used in the case that steeping depth don't exceed one meter and steeping time don't exceed 30 minutes. Touch Screen Operated and Scratch Resistant, turn wrist lit screen by auto or manual. Compatible with Bluetooth 4.0 Android 4.3 or above and IOS 7.0 or above smartphones, such as Samsung Galaxy S5/S4/ S3/ Note 4/3; LG G2/3, HTC one; iPhone 5/5s/5c/6/6s, 6/6s Plus, etc.