Ⅰ. [Heating and Cooling Mode] 1.7M Extended Temperature Sensor Large LCD display and Plug-and-play design, just plug the heater into this thermostat plug socket and set the parameters. The thermostat timer plug will control the heating/cooling mode according to the start and stop temperature. Ⅱ. [Plug and Play] Easy to program and safe to use. Just plug the temperature controller into the socket, then select the control mode. Temperature control range: -40℉~248℉(-40℃~120℃), temperature control accuracy: ±1%. Celsius and Fahrenheit can be converted. Ⅲ. [Timing Function] The thermostat timer socket has a time cycle and countdown function. F01: Cycle timer mode; F02: Countdown on mode; F03: Countdown off mode; F04: Countdown ON and Countdown OFF mode. Time range: 0-99 hours 59 minutes. Ⅳ. 【Wide Application】 This adjustable temperature outlet plug is widely used in greenhouses, incubators, terrariums, freezers, refrigerators, heaters, coolers, heat mats and other temperature-controlled systems. Ⅴ. [Backlit LCD Display] The backlit LCD display of the temperature controller timer can easily check the current and set temperature value in a dark environment.