My understanding of smart RTH is that it will kick in automatically when it detects there is just enough battery juice left to make the return trip. This will occur even if you have solid connection to the controller and didn't press RTH button.
New recreational (for now) flyer here from Central New York (Syracuse Area). Drone of choice was P4. I purposely bought it in the dead of winter so I wouldn't be tempted to fly it as soon as it arrived. That gave me a lot of time to "study". I now have 13 flights under my belt and I look forward...
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