Includes the diffuser and 1 vial. D.A.P. (Dog Appeasing Pheromone). Electric diffuser emits pheromones to help calm and reassure your dog. Stops or prevents fear and stress in puppies and adult dogs, such as: separation anxiety, destruction, barking/whining, house soiling, excessive licking and phobias (thunderstorms/fireworks). Comforts dogs in stressful environments. 1 vial lasts approximately 4 weeks. Covers area up to 650 feet.