Ordered the atomiser and plug-in on the 14th of February and parcel arrived on the 20th of February for my stressed cats. I have noticed some improvement in my two females, they are calmer, not hissing so much and they do not hide that much from the kittens currently fostered at my place. For my 2 boys I did not see any difference so far, but I am still observing as effects may appear within some weeks