The single-output Plug‘n’Grow External Probe Day & Night Temperature Display Controller with adjustable differential from ±2 to ±9 degrees Fahrenheit operates a heating or cooling unit (not to exceed 120 volts, 15 amps or 1 horsepower) within predetermined day and night settings. Sensor extends up to ten feet, and controller displays the current temperature on the front of the main unit in degrees Fahrenheit (36 to 104 degrees) or Celsius (2 to 40 degrees). Includes a one-year manufacturer’s warranty and daily technical support.