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The new 9800i Series has all the features of the innovative 9700i Series with the addition of humidity sensing and control.* When coupled to our outdoor sensor, the thermostat will automatically determine the optimal indoor humidity levels to minimize condensation on windows. A special humidity calibration feature allows for fine-tuning of the automatic sensing feature. * The 9800i Series currently offers two display options - English or Spanish. • 2 Heat / 2 Cool with Auto Changeover • Compatible with all standard 24 VAC heating and cooling systems, up to two stage heat and two stage cool • 7-Day, 5-2, 5-1-1 or 24 hour programming • 2, 4 or 6 events per day • Integrated Humidity Sensing • Worry-Free Memory Storage • Indoor/Outdoor Remote Sensor Capable • Adjustable 1st & 2nd Stage Temperature Differential • Serves as a Humidistat • 5 3/8" W X 4" H X 1 1/8" D