Selectable to 5-1-1 (Weekdays, Saturday, Sunday) or 5-2 (Weekdays, Weekend) programmable thermostat. Large, clear, backlit display - easy to read in various lighting conditions. Display size options - available in large screen or standard. Precise comfort control (+/-1 F) - maintains consistent comfort to the highest level of accuracy. Simplified programming and operation. Easy change battery door - flip out door allows for easy battery replacement without removing or disassembling the thermostat. Built in instructions - simple, pull out instruction manual. Adaptive Intelligent Recovery- ensures programmed temperature is reached by programmed time. Temperature range stops - prevents user from setting the temperature too high or too low.