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Thank you for your question. Our Best Buy essentials™ 10’ Lightning to USB Braided Charge-and-Sync Cable doesn't have a specific maximum wattage output on its own. The wattage at which your iPhone charges is determined by the power adapter you plug the cable into and the charging capabilities of your iPhone. This cable is designed to safely handle the maximum charging speeds that Apple devices typically support with compatible power adapters. So, if you use a 20W USB power adapter (or higher wattage that your iPhone can utilize), the cable will be able to handle that power delivery for charging. The cable itself doesn't limit the wattage; the power source and your device do. If you have any other questions or need further assistance, feel free to ask! - Mae | BestBuy Essential Support
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