Chinese SkyWalker quadcopter controlled by a 10 km fibre optic cable which is also used for video transmission. The fibre optic offers higher video and control link quality as compared to radio, which is demonstrated in the second part of the video which compares 5.8 GHz radio video with the fibre optic video. The fibre optic link is therefore also claimed to be resistant to electronic countermeasures (jamming) although this doesn't apply to GPS jamming. In the first video, the operator first does several loops around trees, likely to demonstrate that the drone can actually do complex maneuvering which was often raised as a problem for fibre-controlled drones.