Those are ONLY for TESTING the interface board, watch these videos on how to do that:
Power On Self Test interface board Retevis RT97S/midland mxr10 GMRS two-way radio repeaters
https://youtu.be/xxLGerVUqKg
test the interface board for Retevis rt97s or midland mxr10 GMRS two-way radio repeaters
https://youtu.be/xxLGerVUqKg
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