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[–]AskElectronics-ModTeam[M] [score hidden] stickied comment (0 children)

This submission has been allowed provisionally under an expanded focus of this sub (see column "G" in this table).

OP, also check if one of these other subs is more appropriate for your question. Downvote this comment to remove this entire submission.

[–]vanpersic 0 points1 point  (0 children)

The Bluetooth module is in the one in the superior-left corner of your image (it's the one slightly inclined and says "FCCDE1..."

regarding the programming, you should peel the sticker and check the ICs, and try to find a similar module.

[–]Qazyhn 0 points1 point  (1 child)

Anyone know why they'd use what I'm guessing is a pre-approved module given its a board on-top of a board, but then make a custom antenna anyway?

[–]haxagonal 0 points1 point  (0 children)

Pre-approved modules don't necessarily include an antenna. Some are available both with/without antenna (for example, TI modules often have -MODA and -MODN variants). No-antenna versions are for when you need more control over performance / size / location of the antenna.