https://www.electrodragon.com/product/lc-05-bluetooth-serial-moduel-masterslave-in-one/
This is a combination board of NBL1057-dat and NBL1018-dat, please read their documentation seperataly.
For module functions please read NBL1018-dat
For board setup please read NBL1057-dat
Demo Video
ref
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based on module - NBL1018-dat - NBL1022-dat - NBL1057-dat