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Nokia 8 IR Range Finder

I just read somewhere Nokia 8 has IR range finder just top of the flash. I had no idea It is IR range finder, I always thought It is for laser autofocus or something else or maybe a design choice. Anyway, I would like to ask if It is possible to use IR range finder as a remote controller?

Also, I have never seen before a smartphone has IR range finder to help the camera to focus. Has anyone seen It before?

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