Exact dosage feed up to 27 days long with a daily feeding multiple feeding per day possible smallest time possible between feedings 2 hours feeding program can be rerun every 24 hoursvolume of each food tray 35 ccmfood trays removable and machine washable power connection 24 vthe grsslin automatic feeder has a diameter of 165 cm und is appx 35 cm tall it is used with a fixture attachment attaches to the glass pane in open aquariums or can be placed on the aquarium enclosure in this