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Thanks for your question. Our JBL PartyBox Stage 320 does not have a USB audio output jack, it supports a USB port, wherein you can connect a USB storage device or charge your mobile device. It also has an AUX IN to connect an external audio device through a 3.5 mm audio cable (not supplied).
Sorry, there was a problem. Please try again later.To connect a USB storage device to your JBL PartyBox Stage 320, simply plug the USB stick into the USB port on the back of the speaker. The speaker will automatically switch to the USB source and begin playing the audio files. Ensure the USB stick is formatted FAT16 or FAT32 and contains playable audio files like MP3, WAVE, or WMA, according to JBL support.
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