I used to use the HRM chest strap. Almost nothing works the way the documentation says it does. Syncing is always random, general usage is very vague and vague as to the specific requirements to run in normal modes that anyone running would need. For example, when you're trying to watch an offline workout (i.e. a workout recorded on device because you didn't take your phone for a run). Check out their web help page for the following: In the Wahoo Fitness app, select Sensors Select TICKR X and scroll down Select End Offline Workouts because offline workouts are not on this screen in iOS is shown. Does not exist. So one can only guess where it is and if it worked at all. Worst technical documentation I've ever seen. When I contacted support, they responded with a prepared message that ignored any specific help question I had asked. My recommendation is to buy something else.
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