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Specification 1). Main rotor Dia. (Upper): 175mm2). Main rotor Dia. (Lower): 175mm3). Overall Length: 180mm4). Drive System; 2 * 1215 strong-magnetic motor5). Battery: 3.7V 400mAh Li-Po6). All-up Weight: 53g (Battery included)7). Transmitter: Wk-24018). Gyro: Built in9). Receiver: RXX-240210).Servo: weight 3.5g;speed 0.11sec/60