This expandable four-tray system dehydrates fruits, vegetables and makes homemade jerky from meat, poultry and seafood. It's easy to use and easy to store. The drying trays nest when not in use for over a 35% reduction in storage space. Dehydration maintains natural vitamins and minerals with no additives or preservatives. This Presto model includes four drying trays, expandable to eight trays for added drying capacity. The Bottom mounted fan and heating element provide consistent air flow for optimum drying with no tray rotation necessary. A See through cover on the top tray lets you monitor drying progress. Drying trays and cover are fully immersible and dishwasher safe. Accessories sold separately. Additional trays sold separately. Fruit Roll Sheets, Non-stick Mesh Screens, Jerky Gun and Jerky Seasoning also available.