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2845 mp3 circuit board products are offered for sale by suppliers on Alibaba.com, of which pcba accounts for 19%, mp3 players accounts for 18%, and audio and voice control modules, kits accounts for 1%. A wide variety of mp3 circuit board options are available to you, such as wma, wav and ape.You can also choose from voic recorder, game and e-book reading mp3 circuit board,as well as from black, white, and silver mp3 circuit board,