I have the TRX, don`t use it for gold only coins. Use no sound, just vibrate, leave it at high sensitivity and desensitise (with button push) on each target. Doing this tells me if the target is coin size or larger same ID junk, thus stopping the problem of making a messy hole on park lawns. Like its feature of being able to use AAs or 9v too. A time saving tool, wouldn`t coin shoot without one.