Hate to be a stick in the mud. Had 3 airtronics radios. Never again. All 3 radios had servos that gliched all the time. They were all more expensive heli radios and a Vangaurd. Call the factory and all I could get from them is "Isolate the problem and call us back." I call Futaba and on a problem and it is solved. Actually just sent them a reciever that I messed up by my own fault and they fixed it for free. Great company. Have been with them for 25 years. Will stay with them.