I bought a 30-meter extension cord, but I received two cords of 10 + 20 meters, which I did not want. I requested a return, but unfortunately, I got stuck with COVID and couldn't return the product. Since I had them and didn't want them, I tried to use the 10-meter one, but it didn't work. I tried to use the 20-meter one, but it also didn't work. Additionally, both had a problem with the female plug. I had to cut them, join them, buy a new female plug, and then they worked. Useless product.