Specification:1) Main Rotor Dia. A : 610 mm2) Main Rotor Dia. B : 623 mm3) Overall Length: 666 mm4) Brushless Speed Controller: WK-WTS-40A-1All-up5) Weight: 833g (Battery included)6) Brushless Motor: WK-WS-28-007W7) Gyro: Built-in 3D gyro