Up to now, SV Tech has 150 patents, including the 8 core patents in the tethered drones: the high-voltage power system, the closed-loop voltage compensation system, the automatic winch system, the automatic following system, the ground workstation system, the quick switch system of the tethered drone, the airborne rescue system and the switch system between RC and CC traction. The tethered drones are widely applied in reconnaissance, communication, inspection, broadcasting, fire rescue and disaster relief.