Zoo Med's Bettamatic Automatic Daily Betta Feeder automatically feeds your prized Betta once daily. It can be used to feed your Betta while you're away on vacation, or to feed your Betta at a regularly scheduled time each day. The Bettamatic Feeder conveniently mounts directly on the side of your tank, or can be used with the enclosed rail kit for use with round fish bowls or other tanks. The Bettamatic operates using one AA size battery (battery included).