Radio Thermostat Company of America CT30e.C1.1.99.simple Programmable Communicating Thermostat without Module, White 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 mille volt gas systems Can control up to 2 stages of heat and 2 stages of cool Requires USNAP Module for wireless control. Choose from Wi-Fi, Zig bee, or Z-Wave