The Pyle PHMD84 Metal Detector provides you with marine grade 100% waterproof precious metal detection ability. Dive in and find precious metals, artifacts, jewelry and more with this fully featured system. Use it on-land or underwater thanks to the included waterproof headphones. Whenever a potential valuable is found, the system outputs an audible tone when the headphones are plugged in. The system also provides visual 'hit' indication with a built-in flashing LED light. Additional system features include adjustable discrimination & sensitivity level controls, adjustable locating arm length, 7.8'' concentric search coil, automatic ground balance for accurate results & more! It will effectively detect buried gold, silver, coins, jewelry and more. Enjoy convenient precious metal detection for buried treasures in depths up to 8.5 inches deep. Battery operated: requires (1) '9V' battery. Compact, light-weight and easy-to-use, the Pyle PHMD84 Waterproof Metal Detector & Headphone System will help you unearth lost & forgotten valuables -- on land or out at sea.