The 9610 Digital Programmable Thermostat is just one of the many “Integrated Comfort Solutions” from Robertshaw. A FIVE YEAR WARRANTY MAKES THIS A GOOD BUY. The 9610 is mercury free and within one degree of accuracy as it creates the environment convenient for you. Program this thermostat for seven and one day settings and even take advantage of the four pre-programmed EnergyStar Setpoints for each day of the week!Choose Farenheit or Celsius display options and remeber there is a quickset programming feature for hurried days or weeks when there’s just not enough time for setting the temperature.This is a 24 AC low-voltage thermostat. Do not install on voltages higher than 30V AC.