Multiple Appliance?This digital temperature controller allows you to precisely control the room temperature, which is widely used for greenhouse, reptile, incubator, terrarium, freezer, refrigerator, heater, fridge, homebrew, vivarium, fermentation, heat mat, and and many places where need to control temperature. It can also be used as a timer for cycle timing and countdown. Various Functions?The digital temperature controller can display temperature control mode and 4 timing modes F01-F04. Besides, it also has calibration, reset function, screen lock protection function and data storage function that all parameters set can be saved after power off. Timing Function?The digital temperature controller has F01~F04 modes for cycle timing and countdown function. F01: Cycle Timer mode; F02: Countdown ON mode; F03: Countdown OFF mode; F04: Countdown ON and Countdown OFF mode. Timing range: 0-99 hours 59 minutes. Please note that this thermostat plug only works in one mode. Heating & Cooling Mode?This digital temperature controller connects to cooling and heating systems at the same time. By setting start and stop temperature, it will automatically switch heating and cooling modes and control the heating/cooling equipment to work. When the start temperature > stop temperature, it will enter the cooling mode; When the start temperature < stop temperature, it will enter the heating mode. Plug and Play?The digital temperature controller is easy to program and safe to use. Just plug the temperature controller into the socket, select the heating / cooling system, then it works, no wring, LCD with precise display.