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This a kind of fast charge of wall mount power adapter.It also is PD Fast Charge Protocol Adaptive Power Adapter which can use for nintendo/apple device.The product support Five Voltage modes which are 5V/3A, 9V/3A, 12V/3A,15V/3A,20V/2.5A.
link:http://www.ht-transformer.com/power-adapter/power-adapter1/pd-fast-charge-protocol-adaptive-power.html
PD Fast Charge Protocol Adaptive Power Adapter For Nintendo/apple