I am flying the Cheerson CX10-C up to the point of signal loss. I have not done any Mods to the controller or the copter. I managed to get about 70 ft. up. Not bad for a $25 quadcopter that is under 2 inches wide. Thanks for Watching. Please Like, Subscribe or comment if you have any questions. I created this video with the YouTube Video Editor (https://www.youtube.com/editor)