Easy to use. Program up to 4 daily feeding cycles of flake food or granules, choosing between single portion, double portion with 1-minute interval, or manual override.All your programmed choices are presented on an easy-read LCD screen,Features a transparent reservoir for "at-a-glance" monitoring of food level and integrated ventilator to prevent moisture from spoiling food or clogging the unit.Two AA batteries included; low battery indicator on cover. Feeding drum volume of 100ml (3.3 fl oz) .6 weeks of food.