Weekday/Weekend programming - 5-2 (Weekdays, Weekend) programming;Backlit digital display - both current and set temperatures are easy to read in various lighting conditions;Precise comfort control [±1 F (± 0.5 C)] - maintains consistent comfort to the highest level of accuracy;Basic operation - easy-to-use slide switches allow you to select the heat or cool mode, and operate the fan;the PRO 4000 has built in instructions - simple, pull out instruction manual;Adaptive Intelligent Recovery - ensures programmed temperature is reached by programmed time