They are offering a mixture of locators. A few of which "appear" to be real electronic metal detectors, the bulk (if not all) of their contraptions are PURE DOWSING rods and MFD/LRL units disguised and dressed up to look like treasure finders that have some electronics associated with them. Don't waste your money on them, unless you just like throwing your money away.
If you want to try dowsing for treasure you can do it with a piece of scrap wire or rod, and I guarantee you will get the same results as any of their pseudo-enhanced dowsing rods. Stuffing a box full of do-nothing electronics and then mounting it on a swivel rod has been going on for years (ie. Omnitron, Electroscope, VectraTrek, RT Examiner and other junk). They all require a dowsing response before they will indicate, and the electronics add NOTHING.