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The Anker 20K 87W Power Bank with a built-in USB-C cable charges devices at multiple voltages depending on what the connected device requests. It uses the USB Power Delivery (PD) standard, so the voltage automatically adjusts for the fastest safe charge. Common output voltages include: 5V (for small accessories like earbuds) 9V (for fast charging most smartphones) 15V (for tablets and some laptops) 20V (for the full 87W output, typically used for larger laptops like the MacBook Pro) You don't need to manually set anything — the power bank and your device negotiate the optimal voltage and current automatically.
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