Innotek SSSCAT is an automated cat repellent using spray to set boundaries in the home. The fully adjustable nozzle uses a motion detector--along with a can of harmless HFC134a gas--to repel cats in a three-foot radius. It"s a fast, effective, harmless and painless way to keep your cats away from certain areas. The refill can holds over 500 sprays and the motion detector uses 4 AAA batteries (not included).