The SENTRY Calming Collar for Cats helps soothe your cat and stop unwanted stress-driven behaviors in a natural and safe way. The 3 pack is perfect is you have more than one cat, or if you want to save money and stock up a three month supply for your only cat. Help your cat be ready for any situation . The SENTRY Calming Collar can help your cat stay calm for frightening occasions like riding in the car, visiting the vet, and staying in an unfamiliar setting. When cats are stressed, they exhibit behaviors like scratching, excessive meowing, and marking their territory. SENTRY's Calming Collar stops these behaviors by using a pheromone that mimics the pheromone that mother cats produce to calm their kittens. The SENTRY Calming Collar is completely safe, effective, and easy to use. Benefits Collar can be adjusted just like a regular collar Breakaway collar won't put your cat in danger Collar doesn't make a mess or cause any harmful effects Each collar lasts for 30 days