Wi-Fi connected 7 day programmable or non-programmable thermostat. Program 7 days on unit or via free app (lux products from play store or apple store), user option: 2 or 4 periods per day, temporary override and manual hold, automatic changeover feature, selectable fahrenheit/celsius setting, adjustable temperature swing (differential), adjustable 2nd stage heat & cool offset, system run-time monitor, air filter monitor, low battery detection, am/pm clock or military time option, easy-view large led back-lit display, easy installation, dual mount: vertical or horizontal, white wall plate included, 3 power options: (2aa lithium batteries) c-wire or micro usb. for use on: universal compatibility for conventional heat & a/c up to 2-stage heat/2-stage cool and for heat pumps with up to 2-stage heat/1 stage cool (including aux/emerg heat), 2-wire heat only hydronic systems (hot water baseboard & radiator), & gas millivolt heaters.