The Fish Mate Aquarium Fish Feeder F14 prevents over feeding while assuring regular and controlled feeding patters are maintained. This feeder provides brackets in order to mount onto the hood or glass edge of your aquarium. A maximum of 1-4 meals per day and 14 meals per re-fill may be offered to your fish through this mechanism for when you are at work, on holidays or to assure a feeding will not be missed with the reliable quartz timer. Granular or pelleted food is suitable for this feeder for small to medium sized aquariums, or up to 40 gallons. 1x AA battery keeps this feeder running for over 1 year with continuous use.