PRO1 IAQ T755 3 Hot/2 Cold 7 Day Thermostat with 4-Sq-Inch Screen 5/1/1 programmable - Easy menu driven programming Intuitive wake, leave, return, sleep programming icons - 4 sq. inch display - Blue back-light Glow in the dark light button - Easy access battery compartment - Electric or Gas configurable Separate B & O terminals - Separate heating and cooling swing (cycle rate) adjustments Filter change indicator (select-able on or off) - Room temperature calibration adjustments