... and tested in the factory, ready to fly out of box .Specification:Main rotor diameter: 540mmLength: 525mmHeight: 185mmWeight: 410gPower system: SUPER ... 2.4GHz!!Receiver: Standard 6 CH 2.4GHz!!Mix controller: 3 in 1 controller (gyro, mixer, ESC)Servo: EK2-0508/000155 digital ... available to keep you flying**Package contents:1 x Helicopter Body1 x 3-in-1 controller (with Gyro, mixer, ESC)(2.4GHz EK2 ...