... Adjustable temp: -20C to 49C RENEL RN20 Refrigeration Devices Intelligent Thermostat for Cooling SystemModel: RN20 Spec. FeaturesDisplayLED digitron displayButtonsUp,Down,Manu,SetCasing ... adjust, defrost normal display and lock-in start freezer temp displayApplicationRefrigeration equipments like Freezer,Refrigerator,Cold storage,Water heater,Aquarium,Fishbowl,Seafood machine ...