I liked everything, now I want something more serious. Pros: The product corresponds to the declared parameters, works properly without any complaints. The device always returns to the starting point when it is lost from the visibility zone and when the signal from the control panel is lost. Cons below: At a range of 200 meters and an altitude of more than 60 meters, the recording signal to the smartphone is lost, the location is not visually determined, but plus that the recording continues on the memory card.