The Snackmaster Pro features and adjustable thermostat so you can dry different foods needing different temperature settings. The adjustable 95-145 degree F thermostat gives you the flexibility to get the best results, from drying herbs to properly cured beef jerky or venison jerky. Patented Converga-Flow air circulation provides the fastest and most even food drying available. Light, which destroys nutrition, is blocked by the opaque exterior. Expandable to meet your needs! Expand this four-tray unit with patented Add-A-Tray accessories up to 12 trays (over 10 sq. feet of drying space).