Here is the summary:
The pulse oximeter feature is supported in only "5X" model. The other models are not supported. I also found out Japanese edition does not support it at all. I am not sure why.....
The other things I found out is to look at SPO2 data on Garmin connect is not supported, either. This product was announced some time the end of June this year. It's been some time and it may supported now. However, reports / reviews I checked mentioned it says the feature is not available. I know Lactate threshold feature is not supported on the mobile application. So I guess some special features which are supported a few specific model might not be supported. This is probably in such category. (Lactate threshold can be seen on the regular web site for Garmin Connect).
It also consumes a large power. If people measure SPO2 value so often, then the total time to use the device with one charge would be shorter. If people using this feature and GPS during hiking, the duration would be impact, especially this device also support embedded music player feature which also eats more power.....
Based on a data I took from hiking on Mt. Whitney Trail a few weeks ago, the range SPO2 without acclimatization is big. Thus, it might be hard to find out a reasonable measured value if the sample size is small. I think we probably need to sample more data to get average to evaluate the data in higher elevation without acclimatization.
Usage for Sleep apnea, it is also better to sample often to detect event of stopping breathing during sleeping. For such purpose, it might be better to use a traditional pulse oximeter to collect data.
I concluded I would wait ./ watch how this feature would be supported. For now, I have everything I need and I will continue to look into reviews by other people......
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