Low Voltage WiFi Thermostat, Stages Heat 4, Stages Cool 2, Temp. Settings per Day 4, Programs per Week 7, Terminal Designations C, G, L, O/B/2, RC, RH, W/E, W2, Y, Y2, WiFi Capability Yes, System Switching Auto-Heat-Cool-Off-Emergency, Fan Switching Auto-On, Display Size 2-1/2 in x 2 in, Display Type Digital, Key Pad Lockout Yes, Programmable Fan No, Automatic Changeover Yes, Humidification Control Yes, Dehumidification Control Yes, Remote Sensing Capability No, Temporary Program Override Yes