Features:  11 Inch Search Coil: 11inch large search coil design makes this metal finder suitable to use in more areas such as shoreline, mountains or fields afar and so on.  Headphone Jack Design: There is equipped with 1/4H headphone jack, any headphones with a stereo plug will work, headphones with a mono plug will not work. Use a headphones will avert the sounds from bothering bystanders and give you a better using experience. (Headphone NOT included)  Humanity Design: The metal detector is in accordance with ergonomic design, comfortable and convenient to use. Adjustable stem can adapt to users of different height.  Suitable for kids and adults, Whether you are a treasure hunter or a beginner, you can enjoy the fun of metal detection.  The installation is simple and convenient, you can complete the assembly by yourself, just connect several parts together.  Discrimination Mode: When the detector emits different tones for different types of metals, and when the detector emilinates certain metals, we refer to this as the detector discriminating among different types of metals, this function is essential for professional metal detectors and allows the user to ignore rubbish and other undesirable objects.    Specifications:  Mateiral: metal+plastics  Search coil: 11inch search coil  Power: 1 * 9V rectangular alkaline battery (NOT INCLUDED)  Reactive overload: 10000 micro-cgs(with standard search coil)  Resistive overload: 1200 micro-cgs(with standard search coil)  Ground balance ranges: from ferrite to salt water inclusive  Discrimination ground suppression: combination of 2ndand 3rd order methods  Adjustable length: 1010mm-1240mm  Package size:  530 * 215 * 128mm / 20.9 * 8.5 * 5.0in  Package weight: 1698g / 3.7lb    Packing list:  1 * Metal Detector Main Unit  1 * Detection Coil  1 * Armrest Rod  2 * Connecting Rod  1 * User Manual