Filtrete Touch-Screen ProgrammableThermostat Large, touch-screen display with bright white back lighting provides easy viewing 7-day, 4-periods-per-day touch-screen programming / One touch Save Energy button to reduce energy consumption when you are away Universal compatibility with common residential central heating and cooling systems / Filter-change indicator to keep system running optimally Wide temperature range: 35 to 95 degrees / System lock prevents unwanted changes to pre-programmed temperature and system settings Partial lock feature allows for temporary adjustment of the program / Low battery indicator alerts you to change batteries for uninterrupted operation