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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.* Note - this unit is being replaced by model 9801i2 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. . 1 Heat / 1 Cool with Auto Changeover . Compatible with all single stage 24 VAC heating and cooling, including single stage heat pump systems . 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 . Serves as a Humidistat . 5 3/8" W X 4" H X 1 1/8" D