... : RN20 Adjustable temp: -20C to 49C RENEL RN20 Refrigeration Devices Intelligent ThermostatModel: RN20Spec. FeaturesDisplayLED digitron displayButtonsUp,Down,Manu,SetCasing colorGrayWiring way7 ... Freezer,Refrigerator,Cold storage,Water heater,Aquarium,Fishbowl,Seafood machine,Dish ordering machine.ect(Spec may have small differences accordingly)Customizing/OEM ...