Align KX019011 T-Rex 250 PRO DFC Super Combo Kit 250DFC main rotor head upgrade set 3GX programmable flybarless system T-REX 250 PRO kit set Required for assembly: Transmitter (6-channel or more,helicopter system) and Reciever, 11.1V 3S Li-Po 850mAh battery x 1, LiPo Charger Includes Motor, ESC, Gyro, Servos and Carbon Fiber Blades