jump back VERSUS forth

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Polyester

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"You can pair the headphone with two devices at the same time and jump back and forth between them."


What do the both words underlined in red mean here?
 
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Rover_KE

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You can switch from one to the other.
What do the [STRIKE]both[/STRIKE] words [STRIKE]underlined[/STRIKE] in red mean here?
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