When we started to show the house, we were amazed at how well this stuff worked to calm down our kitties, especially Winnie.
It is a synthetic version of the pheromone that cats produce from their facial scent glands — the ones they use to mark stuff that they like. So this scent makes them feel at ease, which they will definitely need in the new house. Our sellers have agreed to set these up for us before we move in. With luck, this will make their transition to their new home easier.