Standard Features - Large, Clear, Backlit Digital Display Easy to read in various lighting conditions - Precise comfort control Consistent comfort to the highest level of accuracy - Set point is retain in memory in the event of a power outage - Easy-access battery replacement - Works with heating and cooling - Does not work with heat pumps, multi-stage heating/cooling systems, and electric baseboard heat (120-240V) - Model Numbers - RTH1100B - 1-Year Warranty