National Geographic digital metal Detector is the perfect metal Detector for beginning treasure hunters. It will detect all metals through dirt, rock, wood, and mud. Comes with speaker, headphone Jack, two-piece adjustable STEM, submersible 7 search coil, Low battery indicator, and a large screen display that visually helps you see the size and strength of your find. Customize your search with dual-tone discrimination Mode, sensitivity level control, two modes of operation, intensity meter system, and automatic ground balance. Runs on two 9V batteries.