I'm not sure if the item I ordered is defective. However, I used the 60W port to charge my Note 10 Plus and the C-port charging speed was the same as the wireless charging speed. When charging via port C (min) 600mA (max) 860mA was measured. For reference, the cable used for the charging cable supports a power of up to 100W. Thus, it is doubtful whether the product is defective and the return is not yet completed.
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