Specification: (1).Main rotor diameter: diameter 460mm; (2).Weight:410g; (3).Length:510mm,width:110mm, height:260mm; (4).Power system:370 motor*2; (5).KIT/ARF/RTF:RTF; (6).Transmitter:4 CH (including training switch and simulator port); (7).Mix controller:Receiver and 3in1 Controller; (8).Servo:digital servos;weight:7.5g;torque:1.3kg.CM;speed:0.12S/60. (9).Battery:11.1V 800mAh Li-polymer battery. Product features: (1).Outdoor flight helicopter,great power against wind; (2).Easy to fly with simple operation,designed for beginner; (3).Ready to fly out of box.