The Nesco FD-37 Food & Jerky Dehydrator is perfect for a beginner or an experienced jerky maker. This dehydrator comes with four (13 1/2" diameter) trays and expands up to 7 trays so you can dry larger quantities, with no tray rotation needed. Additional Add-A-Trays sold separately. The fixed temperature control takes the guesswork out of finding the optimal drying temperature when making jerky and the quiet, powerful fan forces heated air down the center chamber, then across each individual tray for consistent drying. The clear top cover lets you conveniently watch the drying process. Sample seasoning and cure packs are included to get started. The NESCO FD-37 Food & Jerky Dehydrator provides the drying power for dehydrating great jerky snacks for the active lifestyle.