Horrible instructions w/ established connection on what was supposed to be the S1 watch, but came as R2. English translation available for links, but Despite attempts to register in app on multiple wifi networks, an error message pops up telling me to check network status when every other app and Internet work fine. Vendor it was purchased from "Light in the box" has good reviews for customer service and support, Unfortunately this App did not get support for mobile iOS device usage from the beginning. Maybe its not meant for the large U.S. market with iOS functions limited. Hopefully this changes considering I paid ~$47 for the supposedly iOS smart watch, <25% the cost of the Apple watch.