Lennox 17A30, iHarmony Smart Zoning System Zone SensorCondition:* New Surplus Stock, In OEM Packaging. Open Box. As Pictured.Additional Notes:* Room to room temperature control for Lennox Residential Communicating Enabled Equipment.* Easy to read 4.3″ color screen with touchscreen interaction.* Displays current zone temperature in center of screen, indoor humidity, mode of operation and current zone setpoint (COOL TO / HEAT TO).* Wireless access through the Smart Wi-Fi thermostat sets the temperature and saves energy from anywhere, using a smartphone, tablet or laptop* Programming flexibility with options for daily or weekly schedules for each zone* In-zone thermostats let customers override preprogrammed settings with a simple tap* Compatible Outdoor Units: EL18XCV / SL28XCV / XC20 Variable Capacity Air Conditioner (up to four zones) EL18XPV / SL25XPV / XP20 Variable Capacity Heat Pump (up to four zones) XC21 Two-Stage Air Conditioner (up to four zones) XP21 Two-Stage Heat Pump (up to four zones)* Compatible Variable Speed Furnaces: EL296V Two-Stage SL280V Two-Stage SL297NV Two-Stage SLP99V Variable CapacityLennox17A30