Premier's SpraySentry Refill will keep your SpraySentry stocked and ready to use. SpraySentry is a harmless way to protect off-limit areas. SpraySentry is a cat deterrent system. Stop your cat from jumping on counters, digging in potted plants, or roaming freely throughout the house. This unique spray deterrent system uses an adjustable sensor to detect a cat's movement within several feet of a designated area. Once the cat has been detected, the system can be set to deliver either an audible warning, short burst of compressed air or a combination of the two.