Universal Application - works with conventional and heat pump systems up to 2H/2C, it"s one thermostat for nearly every application * Program is retained in memory in the event of a power outage Includes change reminders for filters and low batteries * Separate programming for each day of the week - 4 periods per day * Maximum comfort - Smart Response technology learns the amount of time a system needs to reach a desired temperature and adjusts accordingly * Precise temperature control of +/-1 Degree for consistent comfort