The Honeywell PRO 4000 is a programmable digital thermostat from Honeywell that can be installed in your home to provide basic comfort control with the added benefit of energy savings. Also known as part number TH4110D1007. The Honeywell TH4110D1007 differs from the Honeywell TH4210D1005 in that it has only one heat stage, whereas the TH4210D1005 has two heat stages. Both of these model numbers, however, are Honeywell PRO 4000 Thermostats. The PRO-4000 Programmable Thermostat Features: Digital Backlit Display - easy to read in any lighting condition Basic Operation - easy to use interface Precise Comfort Control - high level of accuracy (+/- 1 degree F) Built-In Instructions Weekday/Weekend Programming - 5-2 programming to fit your lifestyle Energy Star Compliant One of the key features of the PRO4000 Thermostat is the programming feature. Programming the temperature in your home to fit your needs is not only energy efficient but it saves you money! Going on a trip over the weekend? Program your thermostat to turn on the day before you get back and walk into your comfortable energy efficient home! If used as directed this programmable thermostat can save you up to 33% on annual heating and cooling costs. The PRO 4000 can be used to replace the following models: Honeywell : T8112 White-Rodgers : 1F78-151 Robertshaw : 8600, 9600 Totaline : P474-1035The Honeywell PRO 4000, TH411OD1007 Specifications: Dimensions: 3 3/16" x 5 3/8" x 1 1/4" Setting Temp Range (Fahrenheit) : 40 to 90 heat ; 50 to 99 cool Display Size: 1.32 sq.in. Stages: 1 Heat / 1 Cool Application: Oil, Gas, Electrical or Heat PumpThe PRO4000 is backed by a 5-Year Limited Warranty and comes complete with operating manual, batteries, and thermostat.