How effective is the cat watch ultrasonic deterrent in keeping cats away from unwanted areas?

The effectiveness of the Cat Watch Ultrasonic Deterrent in keeping cats away from unwanted areas varies. Some users report success in deterring cats, while others may not see the same results. It emits a high-frequency sound that is unpleasant to cats, but its effectiveness may depend on factors such as the cat's sensitivity to the sound and the environment in which it is used.