Wltoys F939 2.4G 4CH RC Remote Control Airplane. 2.4G 4CH Wltoys F929/F939 RC Airplane,Throttle, aileron, tail, vertical tail, aerobatics. EPS material micro motion simulator machine prototype cassutt formula. Rudder servo drive with a can do all kinds of difficult moves accurately. Rudder volume size adjustable two steps. Large LCD screen, you can display a variety of information manipulation. Buy this Toy and Get 48% OFF For Wltoys F939 2.4G 4CH RC Remote Control Airplane.