https://github.com/arduino/Arduino/blob/da9641410a4b8fa0865f0a31d0b884d14f5e7670/hardware/arduino/avr/cores/arduino/HID.cpp

05 01 // Usage page Generic desktop
09 02 // Usage Mouse

a1 01 // Collection Application
  09 01 // Usage Pointer
  a1 00 // Collection Physical
    05 09 // Usage Page Buttons
    19 01 // Usage Min 01
    29 08 // Usage Max 08
    15 00 // Logical min 0
    25 01 // Logical max 1
    95 08 // Report count 8
    75 01 // Report size 1
    81 02 // Input Data, Variable, Absolute

    05 01 // Usage Page Generic Desktop
    09 30 // Usage X
    09 31 // Usage Y
    15 00 // Logical Min (   0)
    25 FF // Logical Max ( 255)
    75 08 // Report size 8
    95 02 // Report count 2
    81 02 // Input Data, Variable, Absolute

    05 01 // Usage Page Generic Desktop
    09 38 // Usage Wheel
    15 81 // Logical Min (-127)
    25 7f // Logical Max ( 127)
    75 08 // Report size 8
    95 01 // Report count 1
    81 06 // Input Data, Variable, Relative

  c0 // End collection
c0 // End collection


00010101
00100101

input bytes (4 bytes)
 0 - 0 data / 1 constant
 1 - 0 array / 1 variable
 2 - 0 absolute / 1 relative
 3 - 0 no wrap / 1 wrap
 4 - 0 linear / 1 non linear
 5 - 0 prefered state / 1 no preferred
 6 - 0 no null pos / 1 null state
 7 - 0 non volatile / 1 volatile
 8 - 0 bit field / 1 buffered bytes
 9 - 31 reserved

00000110
     |||
     ||\ --> data
     |\--> variable
     \--> relative