I'm not happy to have to use this R/C Model Transponder as most modelers of RC airplanes and helicopters have told me as well. I'd like to see the speck on how many full size aircraft were brought down by model helicopters, drones or airplanes. I can't find any data. But with no choice (see fines, this is what I did. I show you how I have to use mine now with external battery to make it easy to switch plane to plane and change batteries as needed, as well.