The Resideo THM4000R1000 Wireless Adapter Thermostat with Red LINK technology is a programmable thermostat designed to work seamlessly with Red LINK-enabled HVAC systems. This thermostat, which operates at 24V AC, provides precise temperature control between 32°F and 120°F. https://www.partshnc.com/thm4000r1000-resideo-wireless-adapter