U.S. Customs and Border Protection (CBP) announced a reclassification ruling in the September 21, 2016 edition of Customs Bulletin and Decisions that resulted in the imposition of duties on FM transmitters for iPods. The item had previously been classified as duty-free products under HTSUS subheadings 8517.69.00 and 8525.60.20, but CBP has ruled that they may be reclassified under HTSUS subheading 8525.50.70 and thus subject to a 3% duty. China, Mexico, Taiwan, and Thailand are the principal suppliers of this product. The final revocation and modification became effective for goods entered or withdrawn from warehouse for consumption on or after November 21, 2016.