Increasingly popular, automatic fish feeders are no longer used solely for holidays & are recommended for permanent aquarium & pond use. Food is served over several hours keeping fish active & reducing the danger of over-feeding. All Fish Mate feeders are very versatile & are fitted with reliable quartz timers.For ponds & large aquariums, the P21 will dispense food slowly over a 5 hour period for approx. 21 days. The fully weather proofed P21 may be pole mounted at waters edge or suspended over the water. FeaturesReliable & accurate quartz timer Over 12 months ....(continued here)