[Anxiety Relief] This cat calming collar can start working within 1 hour and continuously releases pheromones, which effectively relieves fear or stress caused by heat, noise, traffic, travel, visits, pet loneliness, separation anxiety and other problems. Help cats to adapt to challenging environments.[Plant Essential Oils Safe and Effective] This calm collar is made of high quality TPE material, hypoallergenic and non-addictive, safe to use. The natural plant essential helps to relieve tension and anxiety. Effectively to clam cat's mood, help relax and eliminate aggression. (No harmful ingredients citronella oil)[Lasts 30 Days and Waterproof] This calming collar release pheromones for up to 30 days. Superior, long-lasting pheromone delivery. It can be worn continuously and replaced every 4 weeks for best results. And the calming collar is waterproof, no need to remove when bathing or playing in the rain.[Flexible Adjustable] This calming collar is very flexible and comfortable to wear, featuring 15 inches/38cm adjustable length. You can choose the right length according to your cat's neck and cut the excess, which is perfectly fit for almost any type of cat, kitten or even puppy.[Set Includes] The calming collars are specially designed for scared, stressed, anxious or overactive cats, relieving their anxiety. This set contains 4 calming collar that are packaged together in a beautiful box, convenient to use and store.