The Energy Saving Remote is designed for easy use for you and your guests. Our remotes are designed to replace the original remote while maintaining all of the existing features. By choosing a temperature range say 21-24°, your guests won’t be able to run the air conditioner at maximum output, yet still remain comfortable. End result is energy saved, reduced wear and tear and best of all your guests will be comfortable. Each remote can be installed and set up in minutes. Simply swap & save. The Ultima II ESR also has a Pseudo temperature display. If you set the remote to 21-23°, the remote display will show 19-25. A 2° difference will be negligible for your guests.