The serial number is located in the battery compartment.
What are the provided rubber pads for ?
The rubber pad is located at the end of the MiniDrone arm. This part can be worn if the MiniDrone rolls regularly over uneven or rough surfaces (ex : concrete, gravels). To reduce this part wear, you can put the MiniDrone in Auto-balance position while rolling over these types of surface. If the wear is too high, replace the rubber pad as indicated on the diagram below.
The jumps of my MiniDrone are smaller than 80 cm.
The jump distance depends on the battery level and the type of floor surface.