We bought it for the house for the bedroom windows, you can't see anything inside except at night when you turn on the light. It works as follows: where the space is brighter, it is visible, where it is darker, it is not visible. The space darkens significantly, so at night you shouldn't have any light, otherwise curtains are needed. It is only good for the day, the installation is a bit difficult, you have to put water on the glass otherwise it sticks and ruins them. If you don't have good knowledge, give some money to specialists to install them for you.

Very good membrane. I installed it on house windows. Good quality and easy to install. There is also a relevant video that explains exactly

When it is daytime, it does its job very well and it is exactly like in the photos in the samples.
When it is nighttime and you have light inside - it does the exact opposite, meaning everything inside is visible (but this was expected, I am just writing it for someone who doesn't know).

Very bad impression from the product which was full of dust when I opened it.