As all of you know (or should know) in the US drones in the Spark weight category must be FAA registered and the registration ID posted on the drone body. Since I abhor the look of sharpie or other types of markers I used a flat label maker with transparent tape to attach my FAA registration number on both sides of the drone. This is what it looks like, with parts blocked out for obvious reasons. I also labeled my batteries (1, 2, 3...) in the same manner. Enjoy.