The Premiere Edition Underwater Metal Detector is 100% submersible- works in fresh and salt water up to 32.8 feet/10 meters. This metal detector also features two operation modes, one which detects any type of metal and the other which has the capability to distinguish differing metals. It also features a 10 Inch extendable search coil, adjustable knobs for sensitivity, discrimination sensitivity, volume controls for headphones (included) and a low battery indicator. An LED light flashes red when a target is detected and a distinct audio tone will sound, depending on what has been detected. Operates on four x AA alkaline batteries (not included). Protected by a One Year Limited Warranty.