The NESCO FD-1040 Gardenmaster Digital Pro Dehydrator is ideal for drying and preserving large amounts of fruits, vegetables, herbs and jerky. 1000 watts of drying power means you can dry more, faster. This dehydrator comes with four (15 1/2 inch diameter) trays and expands up to 20 trays so you can dry large quantities at once, with no tray rotation needed. The digital timer is programmable for up to 48 hours of drying time. The quiet, powerful Converga-Flow fan forces heated air down the exterior pressurized chamber, then horizontally across each individual tray.