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.