HTS code 9902.16.30 covers "Feeders designed for use with fish, each with a self-contained electric motor powered by batteries, with retaining clips or clamps to attach to a household aquarium, the foregoing which can be programmed to disperse various quantities of food at preset times (provided for in subheading 8509.80.50)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.