NATIONAL GEOGRAPHIC's digital metal detector, with its low price, is an ideal tool for beginning treasure hunters. You can quickly learn how to use the metal detector: move the search unit in circular motions parallel to the ground. In case of detection, the device gives an audio signal. With 3 different tilt angles, it is even possible to determine the type of metal found. The LCD display also shows the type of metal and the relative depth of the object found. Detects small objects up to a depth of 20 cm, larger objects deeper. FEATURES: battery charge level display, operated from 2 9V batteries, acoustic + visual indication of metal type, 3 types of acoustic indication to distinguish the metal, display of relative search depth, adjustable length: approx. 100 - 125 cm, adjustable sensitivity, built-in speaker and headphone jack ( 3.5 mm jack) volume control LCD display padded armrest and handle for comfortable use SEARCH MODES: All Metal: The metal detector reacts to any type of metal DISC: Metal types with conductivity below the selected value remain hidden NOTCH: Certain metal types with conductivity remain hidden