have tested it with my mi9 and Samsung galaxy s8 so far. works perfectly fine at the moment. comes with a usb cable included, you can connect it to any regular usb charger. will save some regular wear and tear due to phone usb port not being used so often, especially keeping in mind that the mi9 uses the same port for charging as well as connecting earphones.very good price for such a handy contraption.
Support Quick Charge Technology
Qualcomm Quick Charge 3.0,Samsung Adaptive Fast Charge