3 independently controlled comfort settings. 3 speed settings, Digital, LED; control panel;Electronic thermostat; Patented locking extender screens;Designed to fit windows with minimum openings of 25.5 in wide x 8 in high;With extender panels, can extend to width of 6.7-8.7 in. : between 33.7 & 35.7 in.;Reversible Airflow : Manually reverse the fan to intake fresh cool air, exhaust hot stale air or exchange for full room circulation.