Featuresr you must connect phone through bluetooth before user for ios 70 android 44 above bluetooth 40 or above smartphonesr heart rate monitor help you monitor heart rater pedometer fitness housekeeperr sleep monitor monitor you sleep quality improve your healthr it also support data reminder battery level etcr as a smartphone companion and sports partner it is the best product for yourself and your friends r perfect design convenient to take alongr r noter before you use