Honeywell Lyric Wi-Fi Thermostat, T6 Pro Series, 20 to 30 VAC, 0.02 to 1 A Heat, 0.02 to 0.05 A Fan, Programmability: 7, 5-1-1, 5-2 days Program, Geolocation or Non-Programmable, Changeover: Auto, Manual, Hardwired Power Source, Upto 2 Heat/2 Cool Conventional Systems, Upto 3 Heat/2 Cool Heat Pump Stages, Switch Position: Heat-Off-Cool-Auto-EMERGENCY Heat (System), Auto-On-CIRC-FOLLOW SCHEDULE (Fan), Relay Switch, 6.89 sq-in Touchscreen Display, +/-1 deg F Differential, 40 to 90 deg F Heating, 50 to 99 deg F Cooling Settings, 37 to 102 deg F Ambient, -20 to 120 deg F Storage, 5 to 90% RH Non-Condensing Humidity, +/-1 Accuracy, UWP System Mounting, Terminal Designation: RC, R, C, W, W2 to AUX, Y, Y2, O/B, G, K, E, U, U, L/A, S, S, Fan Current: 0.02 to 0.05 A, Heat Current: 0.02 to 1 A, White, Dimensions: 4-1/16 in H x 4-1/16 in W x 1-3/32 in D