For ponds and large aquariums the P21 will dispense food slowly over a 5 hour period for approx. 21 days. The fully weatherproofed P21 may be pole-mounted at waters edge or suspended over the water.* Reliable and accurate quartz timer* Over 1 years continuous use from 1x AA battery* Battery condition indicator* Feeds approximately 21 daily meals while you are away* Food served over several hours - keeps fish active and reduces danger of overfeeding* Adjustable feed quantity and timing for all fish foods* Easily suited to all ponds and large aquariums7" X 7 1/8" X 3 3/8"; Holds 1 ??? cups in drum; 1.69 lbs