You will need:
-USB flash drive. The smaller, the better. (in physical size, not capacity!)
-USB extension cord.
Since I have made my only USB flash drive into a dolphin, today ill be using this bluetooth dongle.
Step 1: Open up your mouse
Step 2: Clean it out
Step 3: The Tricky Part
Step 4: Finishing up
Put the mouse back together, and you're done!