Easy control: Spring operation, can more easily control the up and down of blackout curtains, and stop at any height
Easy to install: Install with 2 screws. Interior Installation: Width at least 1/4" shorter than sash width. For exterior installations, the width should be 6-8 inches wider than the window frame width for better coverage
Blackout This type of curtain blocks 75%-90% of sunlight and harmful UV rays (Dark color works better on blocking light)