Does anyone know what that slot is next to the sync button

DESIGN OF DOUBLE U-SLOT MICROSTRIP PATCH ANTENNA u slot u slot patch antenna with shorting pin Open media 1 in modal 1 of 1 SLOT DEMO u slot patch antenna with shorting pin u slot patch antenna with shorting ungutoto slot U-slot patch antenna with low RCS based on a metaferrite substrate Metamaterial ferrites or metaferrites are artificial magnetic materials which mimic the

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