COOSA Wireless Fitness Tracker & Heart Rate Monitor Smart Wristband with Multi-Functions Activity Tracker for Android & iOS (Black) Managing heart rateBluetooth Pedometer Chronograph Calendar Alarm Clock Call Reminder SMS Reminder Heart Rate Monitor Sleep MonitorTime DisplaySedentary ReminderCalories burned measuringFatigue State MonitorCaller ID Anti-Lost Transmits Heart Rate To Compatible Device Track steps distance calories burned and active minutes TPU material waterproof not afraid of washing hands doing housework walking under rain Short Click and Long Press Control Please Note Feel free to contact us if any question anytime we will try our best help you ASAP System Requirements This fitness tracker requires iOS 7point1 or above Android 4point4 or above and Bluetooth 4point0 Meanwhile users should download the correct APP called VeryFit 2point0 on Google Play or App Store and ensure to sync the data correctly We promise that all the products in our store are brand new not second hand or used Tracking Step This fitness tracker would calculate the data when arms or legs move even though did not walk or do sports so the step counting and calorie data is not 100 percent exact sometimes Heart Rate Monitor And also customers need to download the correct APP and set the heart rate monitor on the APP Usually when you touch the screen more than 4 seconds it will calculate the heart rate Please keep the APP open so that it can sync with the bracelet or the BT will be disconnected Bluetooth connection or synchronization disconnection Users should keep the distance in 05m between fitness tracker and smart phone when Bluetooth paring And keep 10m after finished the Bluetooth pairing