How can a heart rate monitor has auto on/off? How does it know when to start/stop?Mine does turn it off after some time without signal. Some people don't like it because they forget to turn it on.
I don't have all functions in one device. I have Sigma BC1606 (wired) with cadence & Bike 2 options (I have two bikes). Since it's wired, it automatically turn on when the wheel move. I like it wired so that the data can be more accurate.
I have Sigma Onyx Fit for heart rate monitor.
To me, these two provide the best value of my needs under my budget.
I do love to have one with GPS/altitude etc. But at that time I didn't know how serious I'm in the training. Next time when I upgrade my bike, I would consider one like Sigma Rox 9.0 (or the new Garmin Edge 500).![]()




Mine does turn it off after some time without signal. Some people don't like it because they forget to turn it on.
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