Excalibur Model 2400 4-Tray Dehydrator 4 Sq/Ft. Drying Space Black 2400. Drying Space Adjustable Thermostat ON/OFF Black Finish. The 2400 series is a non-timer on/off dehydrator with 4 trays. A 220 watt unit with a 4" fan and 4 square feet of drying...