What is the male interface of Omega constellation strap?

This watch belongs to the constellation series of Omega watches, so the dial of this watch is dark blue, because our starry sky is actually dark blue, and it shines with the stars at night, just like the dial of this watch.

It is a combination of dark blue and silver. At first glance, it feels like being in the starry sky. Because I personally prefer to look at the stars, this watch won my heart, and I also like the name Constellation Series.