Nurture Calm 24/7 Feline Pheromone Collar is a calming synthetic mammal pheromone collar that helps cats in fearful or stressful situations (separation anxiety, fireworks, thunderstorms, visitors, new puppies / kittens, new baby, vet visits, travelling). Nurture Calm 24/7 Feline Pheromone Collar is activated by means of the body temperature of the cat, it goes where the cat goes, whether it is at home or on the go. Nurture Calm 24/7 Feline Pheromone Collar lasts for 30 days. It mimics the pheromone that the mother produces to calm and reassure her kittens. Cats recognise these pheromones throughout life. It mimics the natural way to help cats cope with new and fearful situations.