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Hi Smhunter1983, These are great pre-sales questions about the flexibility of the BRAVIA Theater Rear 8 wireless rear speakers. Powering: The speakers are required to be powered via the included AC power cord. They must be plugged into a wall outlet to function. Wireless Use: The speakers do not have a built-in battery. The term "wireless" refers only to the transmission of the audio signal from the compatible soundbar or TV. If you are looking for Sony rear speakers with built-in batteries for true, temporary cord-free placement, please check out the Sony SA-RS5 model, as those are specifically designed with this feature. Thanks for choosing Sony. Best regards, Eliab
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