Pyle PHMD84 - Metal Detector with Waterproof Search Coil and Headphones - Adjustable Sensitivity and Discrimination Controls -  Adjustable Length and Arm Support 100% Waterproof Metal Detection Performance - Adjustable Discrimination & Sensitivity Level Controls Included Waterproof Headphones Also Provide Audible 'Hit' Alerts - Flashing Digital LED Light 'Hit' Indication Also Functions as Standard 'On-Land' Metal Detector - Waterproof Safe in Depths up to 130'+ Feet Battery Operated: (1) 9V Battery, Not Included - Automatic Ground Balance - Headphone Jack (3.5mm) Locating Sensitivity: Max Depth 8.5'' inches - 7.8'' inch, Concentric Submergible Search Coil