All gold detectors are based on the same technology. Of course there are different types and models but they are all variations of the same electromagnetic technology. A magnetic field is created inside the gold detector that reacts with the magnetic field of a metal on the ground. The metal detector has the ability to convert this reaction into a signal that tells you that metal has been found on the ground. The most important aspect of gold detectors is tuning. You have to carefully calibrate the gold detector to properly receive the signals from the ground, depending on what you are searching for. Often, this process must be performed (usually by pressing a button) every few minutes depending on the gold detector type. Another important factor is motion. Some gold detectors require a fairly slow swinging action .. more»