I ordered a Versa 2 on the understanding that it has a pulse oximeter. However, what the promotional materials and reviews did not mention is that it only reports O2 'variation' (whatever that means) and only during sleep. Furthermore, any further details require a paid subscription (not advertised upfront either). I am not interested in yet another membership. Is there any way to obtain a %O2 saturation from the Versa2 or any Fitbit smartwatch? Otherwise, I will regrettably have to return my new Versa 2.