Our refurbished Sirenas are incredibly popular because they have some great functionality for the price -- including automatic, programmable buttons. The key with the two programmable buttons is that you have minimums below which you cannot program them: The single cup cannot produce less than 1.5 oz and the double 3.0 oz. If you try to program them for less than these minimums, the programming will not be saved and it will revert to the default values. Watch Gail as she walks us through programming our demo Sirena.