RC ERA C190 (H145) RC Helicopter RTF Dual Brushless 6CH Optical Flow Positioning. RC ERA C187 (EC135) RC Helicopter 1/48 4CH 6-Axis Gyro Brushless RTF Aircraft. RC ERA C189（MD500）RC Helicopter 1/28 4CH Optical Flow Positioning RTF Airplane.
Yuxiang F09S RC Helicopter 2.4G 6CH Gyro GPS Brushless Optical flow positioning
Yuxiang F09S RC Helicopter 2.4G 6-axis Gyro GPS Optical Flow with 5.8Ghz Camera
