Featuresr you must connect phone through bluetooth before user for ios 60 android 43 above smartphonesr it support callmessagee mailevent notice convenient to use r sync time the watch time will synchronize with mobile phone time after finished buletooth time calibrationr sos use just support for android not support for iosr find phone perform the fine phone function the mobile phone will alarm andor vibrate to remind userr it has functions such as pacer safety range notice