I bought my first 32x32 LED matrix, but it has no 'D' connection...?

It's a pretty useless picture, very fuzzy.
Indoor-P7-62-LED-Module-244mm-x-244mm-32x32matrix-1-16-Scan-SMD3528-LED-for-7.jpg_640x640.jpg

Indoor-P7-62-LED-Module-244mm-x-244mm-32x32matrix-1-16-Scan-SMD3528-LED-for-7.jpg_640x640.jpg