EFO-S BLACK K5 Wireless Activity and Sleep Monitor Pedometer Smart Fitness Tracker Wristband Watch Bracelet for Men Women Boys Girls Ladies Man iPhone Sumsung HTC(Black) Register the watch fully at first..Download and install into smartphone and use app to connect watch and phone.Please remember to open the bluetooth about phone. And customer needs to register account for app. 1) Pedometer:Record daily walking of steps and mileage. 2) Dear Friends,Please Note-Calls and SMS vibration reminders :Just for Android system mobiles,not for Apple system EFOSHM is our USA registered brand. Please charge the device to a full charge before use. Sleep Monitor:TW64 is able to detect how long you sleep, through its health software, count up your time of deep sleep,light sleep. The energy consumption:Calculate the daily consumption of calories and heat.