A racing transponder that allows your drone to be timed around the track using infra-red. Attach to your drone and record your flight times! Perfect for hardcore racing enthusiasts looking to shave off those extra seconds from their lap times. The I-Lap transponder works with most AMB compatible software and has a sensor distance of 6m in the sun, and 10m in the shade. Each transponder has a unique 7 digit ID number to track your drone. And with an affordable price, you'll be able to really step up your competitive racing without breaking the bank.