They open when the laptop is tilted slightly. I installed them on all mine and uninstalled them soon after. The only reason to have this product is to BLOCK the camera and it does NOT make it reliable. Other products can do that much better.
Aluminum Alloy Laptop Camera Cover (2 Pack)
10 Review
Laptop Webcam Cover Slide: Ultra Thin Round Hole Camera Blocker for MacBook, PC & More (3 Black + 3 White)
11 Review
Blocker Computer MacBook Notebook ProtectorοΌ6
10 Review
imluckies Webcam Cover Slide - Slim Metal Camera Cover for Laptop, MacBook, iPad, iMac, PC - 6 Pack, Ultra-Thin 0.023 inch, Privacy Protection
12 Review