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From inside (document excerpt):
Honeywell CT3451 Programmable Thermostat. Free Owners Guide and Operational Manual in PDF. Programmable Heat and/or Cool Low Voltage (20 to 30 Vac) Thermostat and Wall plate.
Features and Benefits:
– For use with 24 volt central gas, oil, electric heat, single stage heat pump or central A/C
– 4 button programming
– 5-1-1-day programming – 4 periods per day
– Large backlit LCD display shows time and temperature
– Battery operated
– Energy Star rated
– Sequential programming
Source: honeywell.com