4ch Walkera Dragonfly 5-4b RTF Rc Helicopter

Specifications: Main Rotor Diameter A: 340mmOverall Height: 135mmAll-up Weight: 235g (battery included) Main rotor diameter B: 340mmDrive System: 2*180shBattery: LI-Pomer7. 4v 800mAHOverall Length: 425mmTransmitter: 4ch ppmGyro: Built-inReceiver: 3-in-receiver (receiver, speed controller, and gyro) Servo: weight 8. 5g / speed 0. 11sec / 60 (4. 8v)  / torque 0. 9kg. Cm (4. 8v)  / dimension 22. 5*11. 5*24mmModel Features: Coaxial structure is of emulational effect. The usage of cw and CCW spinning of the upper and lower main rotor blades and the auto control of built-in gyro assure your helicopter flying stable and easy. Hm 5# 4 is an optimal mode for the beginner. 2*180sh brushed motors as drive is powerful and suitable for various flight courses. High quality servo is prompt in reaction3-in-1 receiving circuit, capable of servo extent adjustment and built-in gyro sensitivity adjustment, offers you with customized and fine parameter adjustmentHM 5# 4 will fly 8-12 minutes on 7. 4v 800mAH LiPo battery pack, depending on the flight type