This item is provided by Crutchfield.com and includes free phone technical support for the life of the product. Details on how to take advantage of this service will be included with your package. Should you have any issues locating information on how to contact Crutchfield Technical Support, please contact this website's Customer Service department. What's in the Box: 1. Cold Catalyst Filter + Active Carbon Filter unit 2. Anti-Bacterial + High Grade HEPA Filter unit 3. Instruction Manual 4. Filter Replacement Guide