Brand new window blind very long and big can be used for doors too because the length is very long
That is a Zebra Blind (also commonly called Day and Night blinds or Vision blinds).
They are a modern type of roller blind designed with alternating stripes of opaque (solid colored) and translucent (sheer mesh) fabric.
Here is a quick breakdown of how they work and why people love them:
How They Work
The fabric loops around a bottom roller bar to create a double layer. When you pull the operating cord, the front and back layers slide past each other:
Light Filtering / "Day" Mode: Aligning the sheer strips on both layers lets natural light filter into the room while keeping a level of privacy.
Privacy / "Night" Mode: Aligning the solid fabric strips over the sheer strips blocks out the view and significantly reduces light entry.