This detector is designed for accurate detection. Different discrimination circuits allow the detector to distinguish metallic objects between different types of ferrous metals (iron and steel) and non-ferrous metals (gold and silver). You can also choose what type of objects the detector will pick up. Powerful ultra-sensitive discriminator metal detector with waterproof coil that gives you underwater detection up to 180mm. This great metal detector is designed for a wide range of users. It is used by archaeologists, artifact hunters and professional institutions who appreciate its cost-effectiveness. You can search for coins, artifacts, jewelry, gold and silver anywhere, check mail bags for metal, inspect underground pipes and more. Great depth detection for large objects and coins! The shaft length is adjustable and comfortable to use. feature Fully automatic and full metal detector 4 detection modes Large, easy-to-read backlit LCD display Length adjustable stem Nylon brace designed to remove pressure from the forearm Target's unique tone low battery indicator Waterproof search coil Power - Uses six 1.5V AA batteries Operating Voltage: 7.1 - 9.6 Volts Signal frequency: 7.5 KHz +/- 1 KHz Working environment: - 20 degrees Celsius - 60 degrees Celsius Operating Current: Standby - 65mA, Maximum - 150mA Sensitivity: Min. 8 inches (test coin: 50 cents); SEN > 15cm (US quarter) Adjustable length: 103cm-124cm