The Automatic Fish Feeder allows you to feed at any time. You can set a timer for 8h, 12h and 24h for feeding, or alternately manually feed at any time with the press of a button. Available in replaceable AA battery operated or USB rechargeable variations powered by a large-capacity lithium battery that can be used for 3-6 months on a single charge. Storage unit is moisture resistant ensuring freshness at all times for flakes, powder or pellets. Never again will you have to worry about overfeeding, underfeeding or simply forgetting to feed.