Charging depends on circuit of phone. If you have a phone with fast charging eg s6 which can charge at 9V 1.5A, this charger will provide the required volts and amps. If you have an s4 which comes with 5V 2A charger in the box, it won't take 9V or 12V because its circuit is designed for 5V so don't expect it to charge from 0 to 100 in 30mins.
I have used Tronsmart one for normal charging and its a great buy for the price.
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