I was alert after reading a negative review. I had to find one end of my invisible dog fence wire at the far end of my property where I know the wire broke. In the winter a tree fell, the roots pulled up the wire, and in the spring I hit the wire with a mower. I found one end but couldn't find the other. I dug and dug ditches everywhere, but to no avail. Hired a metal detector but found no copper. I ordered this cable locator out of desperation. I found the end of the wire within 10 minutes. Anyone who gave a negative review about no signal after 200 feet clearly did something wrong. My broken wire was 1,000 feet from the invisible fence beacon, and this thing found it with ease. My wire is only 1-2 inches in the ground. I don't know if it will go 2500ft as advertised, but it managed 1000ft with ease. For a cheap wire locator from China, that's damn good. Better than paying $600 for a Greenlee/Tempo cable locator. Would definitely recommend and will look to other Rocky Mars/Noyafa products if needed.