1. Plug and play: easy to program and safe to use. Simply plug the temperature controller into the socket, then select the timing mode and set the start and setpoint temperature to control the heating or cooling devices. Temperature control range: 72°F176°F/40°C120°C. Accuracy: ±1%. 2. Heating and Cooling Mode: The thermostat timer plug controls the heating/cooling mode based on the start and setpoint temperature. When the start temperature is > setpoint temperature, it switches to cooling mode; when the start temperature is setpoint temperature, the device switches to heating mode. 3. Timing Function: The thermostat timer socket features a cycle timer and countdown function. F01: cycle timer mode; F02: countdown ON mode; F03: countdown OFF mode; F04: countdown ON and countdown OFF mode. Time range: 099 hours 59 minutes. 4. Backlit LCD Multiple Functions: The backlit LCD display of the temperature controller timer allows you to easily check the current and set temperature values in dark environments. Additionally, it includes calibration, memory, and reset functions for enhanced convenience.