YXZNRC F120 3D 2.4G 6CH 6-Axis Gyro Direct Drive Flybarless RC RTF Helicopter. YXZNRC EC135 6CH Gyro 2.4G Flybarless Optical Flow Altitude Hold RC Helicopter. With 6-axis gyroscope adopted. It has a stable, fast and accurate flight attitude, which is especially suitable for beginners.