If indicates how many interfaces the device has. MxPwr is the maximum power draw for this device configuration, in milliamps. Refer to USB specification clause 9.7.2 for further information on configuration descriptors. Alt indicates which alternate setting of this interface is being described. Cls indicates which class the alternate setting of the interface corresponds to, in both hexadecimal and as a character string.
Sub indicates which sub-class the alternate setting of the interface belongs to.
Driver indicates which of the various USB drivers has claimed this interface. See USB specification clause 9.7.3 for further information. Endpoint 0 is not displayed. Ad indicates the endpoint address, with a letter to indicate whether the endpoint is an In or Out endpoint. MxPS indicates the maximum packet size this endpoint is capable of sending or receiving, as appropriate.