PetSafe's SSSCAT has two elements: a motion detector and an aerosol can. It will detect the cat's motion and it will release a spray. Once this is repeated a few times, the sound will be enough to keep the cat away from unwanted areas.
•Motion detector activated
•Harmless, painless
•Scentless, stainless
•Repels cats for up to one meter
•Leaves no residue
•Requires no training
•100% safe for humans, animals and the environment