RC ERA A61 RC Helicopter Airwolf 4CH 6-axis Gyro Optical Flow Positioning Plane. RC ERA C138 PRO RC Helicopter 1/33 6CH 6-Axis Gyro 2.4G Optical Flow Positioning. 6-axis gyroscope: 6G mode, using a 6-axis gyroscope for stable flight, especially suitable for beginners to fly;.
