If you have more than one JBL speaker and you want to connect them all then see a concise guide for you to connect them all at the same time with one device:
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Turn on the bluetooth connectivity mode of all the speakers.
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Connect all of them with your mobile.
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Download the JBL mobile application from the Play Store or apple store.
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Then tap on the connect option from the application and you will see all the devices within 30 seconds.
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Connect them all and use them in different sound modes.