Please install the apk/app firstly before purchase,in order to avoid not compatible with your phone.
The picture is only for reference,please consider carefully before purchase.
Exercise Mode:Press and hold HOME for 3 seconds to enter the sub-menu of exercise mode;
When exercise finished, double-click HOME key then press and hold HOME key to save the data;
Make sure the band has been paired with your phone before you save the data to the APP.