There are ports on the ReVIVE DualFLUX labeled 1X and 2X

The DualFLUX has two USB ports, 1X power and 2X power.

The 1X port will provide up to 2 amps of charging power and will charge devices needing 2 amps or less to charge, while the 2X port will provide up to 2.1 amps of charging power and will charge devices that need at least 2.1 amps to charge.

Some larger devices such as tablets require more power flow when charging, if the device to be charged does not accept a charge in the 1X port, please try it in the 2X port.