Hi Valeriy, I am not sure if this is a feature request or just a how to. Anyway, I tell you what I want to do.
I want to record the HR and SPO2 during apnea walks. (Actually I am walking up and down the staircase in may home. Up = Hold, Down = Breath). So I am envisioning a start/stop button that with the first short tap starts the hold and with consecutive short taps switches between hold and breath. With a long tap the session ends.