Garrett Infintium L/S. : Not your typical metal detector. This uses a pulse interference to detect a wide range of metals both Ferris and non-ferrous based including presious and semi presious. Although never proven it was said it would detect a good Nugget the side of a grain of rice through 20 feet of sand. I had great aspersions until I fell ill and lost my legs. This detector can be used both on land and in the water. I think different head phones may be required