Product DescriptionTacklife - Professional team on Amazon, which deals only with development of the tools. We commit ourselves to using qualitative tools to improve the quality of lifeTacklife MMD02 Metal Detector has large LCD display, DISC mode & all metal mode, ideal for detecting iron nail, aluminum, silver, coin and jewelry etc.Note:1. Change the battery if the low battery indicator on the LCD Lights.2. In order to save power, do not turn on the back-lit on all the time when you operate.3. If you don’t plan to use the unit for a week or more time, remove the battery. The battery can leak chemicals that can destroy electronic parts.4. This metal detector comes with a 9V Carbon Battery and has a shorter battery life than Alkaline batteries; Alkaline battery are recommended and can be used for a long time.Factors That Affect The DetectingIt's difficult to have an accurate detecting result. Sometimes the detecting may be restricted by some factors:The angle of the target buried in the soilThe depth of the targetThe level of oxidization of the targetThe Size of the targetElectromagnetic and electrical interference surrounding the targetDiscrimination Mode & Depth IndicatorDISC Mode: you can eliminate unwanted metals, provide more precise detection data and improve your detecting efficiency.Depth Indicator: the detector displays target depth with a 3-segment graphic depth indicator and it is calibrated to coin sized objects.Weight : 1.96 lbsLength: Adjustable stem (31.5-41.3 in.)Sensitivity: 7" deep (Test Coin: US￠25)Battery: 2* 9V batteries（included)Operating frequency :6.6 kHzCoil Size - 7.8 inch waterproof coilLarge Back-lit LED ScreenSpecially equipped with LED backlights and large display screen, which gives a clear reading and makes it easier and more convenient to work in dark places.Low Battery Indicator: remind you replace the batteries when low battery indicator is displayed on screen.Longer Adjustable Stem & Overload WarningWith adjustable stem extends from 16.1-23.2 in. , which provides you comfort position according to your height.Overload Warning: overload warning feature prompt that the detector will not function under large metal object or highly magnetic soil.Detects all kinds of metal--3 Tone AudioThe Tacklife MMD02 metal detector will detect all metals to include iron nail, aluminum, silver, ring, coin and jewelry etc.Low Tone: ferrous metals,nails, screws, etc.Medium Tone: medium conductivity metals, ring, foil, etc.High Tone: high conductivity metals, copper, silver, etc.Waterproof Search CoilCome with 7.8’’ waterproof search coil, you can safely use it in the water, especially suitable for use outdoors, on the beach or in the stream. (Note: the control box is not waterproof)