This video shows how to mount an I-Laps transponder for your racing drone. The I-Laps lap counter makes timing your laps easy and equal for all pilots. Timing with a stop watch works fine but it isn't nearly as fun as passing through the gate and hearing the computer say your name and the new fastest lap time!
The I-Laps lap counting system and transponders are available here:
A more detailed look at the gate itself can be found here::
Unboxing (Part 1) -
Gate Assembly (Part 2) -