Treat your kitty to a feeling of harmony with the Vetality Harmony Pet Calming Home Diffuser Refill for Cats. This diffuser works like magic…but it’s science. Using P.E.T. pheromone, this calming refill is slowly and effectively distributed without electricity. That means you don’t have to worry about plugs, batteries, or cords. Each pod provides calming benefits that can stop stress-related behaviors for up to 30 days. Plus, there are no harsh chemicals. Bring a little zen to your whiskered wonder’s life with this diffuser refill (diffuser sold separately).