Features: All Metal Mode: A general searching model can respond with di-di tone to all mental, whic can\'t discriminate metal type. Discrimination: Unit can recognize the mental type in different tones, say short, long or silence. At different DISC position, unit can reject different undesired objects. Pinpoint: At this mode, when you find metal object, you can press PIN POINT button to pinpoint the target. Hold the search coil 50cm or more away from the ground, the press the PIN POINT to sweep the search coil over the sound area and release the button when hearing di-di. Repeat this action until you find the target. Waterproof Search Coil: The search coil is waterproof and its diameter is 8.5 inches, which detects targets up to 6 inches deep. Adjustable Length: The metal detectors from 30 inches to 40 inches adjustable stem, suitable for different height people. And with the simple pointer display design, it is perfect for adults and kids.