CEVA Animal Health FELIWAY MultiCat Starter Kit for Cats (Diffuser and 48 ml Vial) #1 brand used and recommended by veterinarians Clinically proven to work. Can see results within 7 days Drug free solution that helps reduce conflict between cats living together. It may help decrease fighting, chasing, blocking and staring FELIWAY MultiCat Starter Kit includes one diffuser head that lasts up to 6 months and one vial that lasts up to 30 days 100% satisfaction guarantee