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Hi BCB! Thanks for reaching out! We’re here to help. The Sony BRAVIA Theater Rear 9 speakers are powered by electricity via a standard AC wall outlet. They require a wired connection to the mains for power and do not feature built-in rechargeable batteries. For battery powered wireless rear speaker alternatives, look to the Sony SA-RS5 Wireless Speakers which feature built-in batteries. If you’d like to learn more about the SA-RS9, please visit our website: https://helpguide.sony.net/ht/2101/v1/en/index.html We truly value you choosing to look at Sony products! Warm regards, Estefany
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