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LuxPro PSPHA732 Programmable MultiStage Thermostat - Fully programmable, digital thermostat with auto changeover for control of 3 Stage Heat / 2 Stage Cool heat pump systems. Compatibility: • Up to 3 Stage Heat/2 Stage Cool: Heat Pump Systems • Will Operate Aux. and Emerg. Heat Features: 7-Day Programming 4 Periods Per Day Auto or Manual Changeover Energy Star Compliant Exclusive Lux Speed Dial® - Makes Reprogramming Easy System or Battery Powered with Battery Free Memory Storage (batteries included) Keyboard Lockout Filter Monitor Temporary Override (CAT24 Compliant) Vacation Override Adjustable 2 or 5 Minute A/C Compressor Delay Energy Usage Monitor Luxlight® EL (Electro Luminescent) Display Clean Cycle® Programmable IAQ Intermittent Fan (Patent No. 6,988,671) O and B Terminals 3-Year Warranty Specifications: Dimensions: 5.90" (150mm) wide x 4.13" (105mm) tall x 1.18" (30mm) deep Heat/Cool Terminals: R, O, B, Y1, Y2, W1, G, C, E. Electrical Ratings: 11/2 AMPS at each terminal, 2 AMPS total 24v AC. System or Battery Powered: 2 "AA" Batteries . Temperature Control Range: 45°F to 90°F (7° to 32°C). Accuracy: ±1°F over a range of 50°F to 95°F. Environmental Limits: Moisture and Dust: meets IP20. Operating Humidity: 20% to 90% non-condensing. Operating Temperature: +32°F to +122°F (+0°C to +50°C). Storage Temperature: -4°F to +140°F (-20°C to +60°C). Electrical Immunity: meets relevant CE specifications.