Honeywell THX9421R5021WW 2 Wire IAQ High Definition Touch Screen Thermostat with Red LINK Technology, White

The Prestige IAQ thermostat is a 2 wire high definition color touch screen thermostat, 7 day programmable and selectable for residential or light commercial use. Controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system.
Product Dimensions ‏ : ‎ 4.5 x 0.9 x 3.5 inches; 9.14 ounces
Item model number ‏ : ‎ THX9421R5021WW
Date First Available ‏ : ‎ December 11, 2014
Manufacturer ‏ : ‎ APR Supply Co.
ASIN ‏ : ‎ B00YXT60V2

Control heating, cooling and IAQ equipment with only 2 wires at the thermostat
Smart Schedule – programs in seconds for any lifestyle
Red LINK wireless communication
Precise temperature control (+/- 1 Degrees Fahrenheit ) for reliable and consistent temperature
Controls up to 4-stages of heat and 2-stages of cool in a heat pump system and up to 3-stages of heat and 2-stages of cool in a conventional system.