ecobee3 lite Smart Thermostat - Black (EB-STATE3LT-02).  Purchased this thermostat for my HVAC system. Used it for about a year until I upgraded my HVAC system, which came with its own programmable thermostat.  Perfect working order, complete with instructions. Can be used with your smartphone to control heating and cooling from anywhere with Internet access.  Normally sells new for $149-$179.