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They have to be plugged in .
Sorry, there was a problem. Please try again later.Hi there, Thank you for your inquiry! The Sony SA-RS3S wireless rear speakers require AC power cords for operation, meaning they must be connected to a wall outlet for power. It is important to note that these speakers do not have a built-in battery. If you're looking for wireless rear speakers with built-in batteries, we encourage you to check out our SA-RS5 model. These speakers come with a built-in battery and are specifically designed to be compatible with the Bar 9, Bar 8, HT-A7000, HT-A5000, and HT-A3000 soundbars. Regards, Jess
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