STF Kronos app is the companion app specially designed for the STF Kronos Activity Tracker and the STF Kronos SW1813H,SB1003HZ,SB1730HZ, SB1357H,SB1330H,SW1314HN,SB1258H Sport Watch. Developed to work with our smartwatches to help you monitor your activity throughout the day & achieve your goals. non-medical use, only for general fitness/wellness purpose STF Kronos watches offer a selection of fantastic features: The stepometer tracks your steps, distance and calories burned. Sleep monitor tracks your quality of sleep. Multiple sports functions, our smartwatch offers a choice of activity types such as running, biking, walking & climbing. In addition to training functions, our smartwatch will also notify you when receive incoming calls or messages. Phone finder feature helps locate your phone or smartwatch should you misplace them.