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"Intelligent R/C system.Full Scale Remote Control.360 Precise Directional Movement.Smooth Hovering Performance.Long Battery LifeEnergy Saving Power Cut-off.The New Version of SYMA BIG SIZE RC helicopter--S031G, its inner gyro with function of dual rate and head lock is designed for helicopters specially. S031 gyro version adopts AVCS ( Angular Vector Control System ), which makes the function of head lock more outstanding and steady. AVCS system: Since rudder trim changes caused by wind and other meterological changes, and varieties of helicopter attiude changes are automatically cancelled, tail rudder operation becomes easy, making it perfect for 3D flight. With SYMA's good quality, it will be the most wonderful BIG gift for kids and your friends."