Excalibur Model 3900B 9-Tray Dehydrator 15 Sq/Ft. Drying Area Black 9 Tray 3900B. Drying Area Adjustable Thermostat On/Off Black Finish; INCLUDES Preserve It Naturally. The 3900 series is a non-timer on/off dehydrator with 9 trays. A 6000 watt unit......