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391 usb sd mp3 circuit board products are offered for sale by suppliers on Alibaba.com, of which mp3 players accounts for 56%, other ics accounts for 4%. A wide variety of usb sd mp3 circuit board options are available to you, such as wav, wma and flac.You can also choose from voic recorder, e-book reading and game usb sd mp3 circuit board,as well as from black, blue, and red usb sd mp3 circuit board, and whether usb sd mp3 circuit board is clip, clip mp3, or headphone.