・Cat Calming Diffuser: 3 units, unused ・Dedicated Plug: 1 unit, used for 1 month ・Feliway Plug (Ceva Feliway genuine product): 1 unit, used for 1 month Total 5 items The diffusers are interchangeable as they are compatible with Feliway plugs. In Europe and other regions, this product is widely used as an equivalent to Feliway. It was effective for my cat who cried a lot at night when I first brought her home. Approximately 30 days x 3 units = approximately 90 days supply.