SmartZone-2L: 2 Zone Controller KIT w/ Temperature Sensor - Replace Honewell, ewc, zonefirst hvac zone control panels 2 ZONES (Temp Sensor Included) MULTI-STAGE Equipment automatically controlled EASY to install & SIMPLE to use Universally Compatible - works with any system BEST VALUE in zoning!!!!! Best technical support and documents (full color install guide included with SmartZone &amp; best online documentation too) Economy Mode allows setback of all zones with the flip of a switch. When in eco mode, the system will only energize if zone 1 makes a call. This feature is great for vacations or if some of the zones are rarely used. Smart staging &amp; limit protection  by using a sophisticated time and temperature algorithm perfected over decades of programming, smartzone stages up and down in the most effective and efficient manner possible. 2nd stage lockout  by setting this dip switch, smartzone will only allow 2nd stage if more than one zone is calling - This can allow for eliminating bypass.