Just surfing eBay and came across this item that claims the following... search for LONG RANGE GOLD LOCATOR METAL DETECTOR WORKS WITH GPX 4500 METAL DETECTOR and tell me what you think - I think it looks bogus... but your thoughts.
NUGGET HUNTER - IDEAL TOOL FOR PROSPECTORS AND TREASURE HUNTERS WISHING TO SEARCH LARGE AREAS QUICKLY AND ACCURATELY - Will find gold in any form, from nugget size to concentrations of gold flakes and dust, concentrations of nuggets, even deeply buried gold veins. Separate switch for GOLD or silver. Can also be used to locate man made gold items like coins, caches, jewelry, and gold artifacts from antiquity. Skilled operators can greatly benefit from the advantages offered by this equipment. Please note : This is not a conventional metal detector and it does not work like you. Target detection is dictated by the motion of the instrument, not sound. If you never used a LRL, it may take a certain amount of time to proper understand how it operates. Fresh targets or test targets normally do not produce a signal response. Long buried targets produce a STRONG response due to the chemical reaction that takes place over time between the metal and the naturally occurring minerals in the ground. LRL produce NO SOUND over target, target is detected by the MOTION of the instrument.
Come on - really?