The Prestige® IAQ Thermostat with RedLINK® features a 7-day programmable color touchscreen that provides control of your indoor climate. Its high-definition, full-color display is easy to read. The thermostat interviews you and uses your answers to program itself (there is no need to work through complicated settings and instructions). WiFi is an option with this thermostat for those who want remote access from their phone or computer. Unique to this thermostat, is its ability to provide you with full functionality from only two thermostat wires. Whereas most thermostats require additional attached wires to provide full function, this thermostat provides full function from just two wires, which makes it a great option in older homes where two thermostat wires is all that is available.