I'm afraid I've got to agree with Buenchico about another cat. I used to have a rather large neutered 'rescue' Tom cat with an absolutely evil temperament. Nothing was allowed in the garden without his express permission, which was rarely given.
Strangely enough he loved children, but only just about tolerated human adults.
Since his demise some years ago I have been using the same items as roslyn251254 and much to my surprise they do appear to work. I have 2, one for each side of the garden.