Note that there is a bundled MicroB to USB-C adapter that comes in the box with your SXFI AMP. This allows you to use the AMP with devices that have a MicroB input. This bundled adapter has the 'host' on the MicroB side of the adapter. 

Several third-party cables or adapters may have the 'host' the other way around (on the USB-C side, instead of the MicroB side). Do note that such cables / adapters do not work with the SXFI AMP.