[Note] HID - Human Interface Device

HID - Human Interface Device
 1. Interrupt IN transfer is necessary in HID
 2. Input Report is also necessary, but Output and Feature Report is optional
 3. Feature reports always use control transfers and are optional
 4. If bInterfaceSubclass = 01h, the device supports a boot interface. A HID with boot interface can communicate with the host even when the host hasn't loaded its HID drivers.
     5. If there is no Report ID item, the report used the default ID of 00h

(Picture from USB bible "USB Complete")