Homewerks Radio Thermostat CT-30-H-K2 Wireless Thermostat with Wi-Fi Module, Dual Wireless Inputs and Touch Screen Sleek 7-day programmable thermostat with touchscreen controls Works with nearly any HVAC system--including traditional furnaces and heat pumps Designed for use with 3AA alkaline batteries and/or 24 volt AC C wire (or a 12-24 AC or DC source) and milli volt gas systems Can control up to 2 stages of heat and 2 stages of cool Able to program up to 4 independent periods per day CT-30 is a component of the CT-30-H-K2. A WiFi module is added to the CT-30 to make it WiFi compatible.