What does Images Remaining mean?

Image remaining means- you are allowed to update your HRTF profile up to five times by submitting up to five images. This is to allow in case you didn't like the quality of your previous one and want to try a new picture. For example: under your profile, if you see images remaining 3 out of 5, that means you can still submit 3 more images. 

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After the trial, if I purchase the lifetime plan, will my device limit and ear image limit reset to zero or 1?

What does "Devices Remaining" mean?