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LuxPro PSP611 Programmable Thermostat With Humidity Display. 5+1+1 programming with 4 program periods per day. Small elegant design Displays relative humidity - just press the "H" button Exclusive LUX Speed Dial® “EL” Illuminated Display Comprehensive Graphical Filter Monitor 5-1-1 Day Programming Energy Star Compliant 4 Periods Per Day Battery Free Memory Storage Temporary Temperature Override Temperature Hold Keyboard Lockout F/C Temperature Display 12/24 Hr Clock Display Adjustable Temperature Differential / Cycle Rate User Temperature Offset / Calibration System or Battery Powered 5/2 Minute Selectable Minimum Run/Off Time For Short Cycle and Compressor Protection Dual power - hardwire or battery 3-Year Warranty COMPATIBLE WITH: Most 24V Heating and A/C Systems 1 Stage Heat/1 Stage Cool: Gas, Oil, Electric, or Single Stage Heat Pump Systems 2 Wire Heat Only Hydronic Systems (Hot Water Baseboard & Radiator) Millivolt Systems (Wall Heaters / Furnaces & Gas Fireplaces) SPECIFICATIONS: Electrical Ratings: 1.5 AMPS at 24 VAC Battery Powered: 2 "AA" Alkaline Batteries (included) WARNING: Use Energizer® or DURACELL® Alkaline Batteries Only. Temperature Differential: Adjustable from .25°F to 2.25°F. Lighted Display: Celsius and 12/24 HR. Time Capable. Accuracy: ±1°F over a range of 45°F to 90°F. Temperature Control Range: 45°F to 90°F (7°C to 32°C). Temperature Display Range: 23°F to 99°F (-5°C to 37°C). Compatibilities: 1 Stage Heat / 1 Stage Cool: Gas, Oil, Electric or Single Stage Heat Pump Systems. 2 Wire Hydronic Systems and Hydronic Air Handling Systems. Terminals: RH, RC, W, Y, G, O, B, C, Solid Pin Connections Allow usage for 24V and Millivolt Systems. Program Settings: 4 Preset Programs Per Day Heating and Cooling. All may be Easily Reprogrammed in 1° F/C and 15 Minute Increments. Technical Service Number Listed for Help in Reprogramming. Circuit Protection: Circuit Protection is Built-in, No Isolation Relays Required. Compressor Protection: Built-in 5 Minute Time Delay Environmental Limits: Moisture and Dust: meets IP20. Operating Humidity: 20% to 90% non-condensing. Operating Temperature: 14°F to 122°F (-10°C to 50°C). Storage Temperature: -4°F to 140°F (-20°C to 60°C). Electrical Immunity: meets relevant EMI/EMC specifications. Dimensions: 4.9" (125mm) wide x 3.2" (80mm) tall x 1.3" (33mm) deep