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" diameter) trays and expands up to 20 trays so you can dry large quantities at once， with no tray rotation needed. Additional Add-A-Trays sold separately. The adjustable digital temperature control (90 F -160 F) gives you the flexibility to achieve the best results when drying different foods that need varying temperature settings. 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. The air flow then converges in the center for quick， consistent drying that is four times faster than other dehydrators. The top mounted fan eliminates liquids dripping into the heater chamber. The NESCO FD-1040 Gardenmaster Digital Pro Dehydrator provides the drying power that generates maximum speed and quality for dehydrating your favorite foods.