Completely unreliable
I don’t know how many times I have contacted myzone about how useless my device is. Have had numerous replacements and still is not reliable. 9 mile run this morning and a couple of minutes of red then grey or zero for the rest of the run. Customer services reply for a bit with the usual comments, how do you wear it, is it clean etc then ignore you. Please do not say that this is an unusual situation, it really doesn’t help or resolve anything