Package includes: Two stick on mirrors
These mirrors attach to your HVAC vents. To apply, close your vents, remove the double stick foam tape from the back of the mirrors, and stick the mirrors to your closed vents. The size of these mirrors allows for the vents to still swivel fully in all directions. So when you need your vents again, just open them up - the narrow profile of the mirror will not interfere.
Video installation instructions: https://www.youtube.com/watch?v=r6Gnow5MbIk