Metal Detector High Accuracy Adjustable Stem 7 Inch Waterproof Coil All Metal & Disc Modes with Headphone Headwear for Underground Coins Relics Jewelry Beach Treasures Features: Adjustable stem lets you adjust the detector's length for comfortable use. Display interface is clearer and faster to read data. With handle and elbow support which can let you carry and operate your detector comfortably, to make sure this detector is easy for people of different sizes, ages. Suitable for finding and testing metal objects, gold and silver jewelry, coins, relics, etc. Whether you are a budding treasure hunter or an experienced metal detecting hobbyist, you can easily use it. Audio alert and pointer indicate the detection of metal. With the volume control knob, you can adjust the output volume of the loud speaker or headphone. Specifications: Main material: metal Color: orange Type: Type 1(With Headphone) / Type 2(Without Headphone)           Type 3(With Shovel & Rack ) / Type 4(With Headphone & Folding Shovel) (Optional) Operation modes: all metal and DISC Sensitivity: Max. depth > 180mm in all metal mode (test coin: U.S 25 Cent) Detect objects: metal (iron nail, iron covering, aluminum loop, small aluminum product, coins, gold, bronze, silver) Operating frequency: 5.69KHz Power-supply: 2 * 9V batterys (not included) Operating current: standby 10mA, Max. 70mA Detection indication: mechanical pointer mode, audio mode Sensitivity: adjustable Volume: adjustable Adjustable stem: Max. length: 1080mm / 42.5in, Min. length: 780mm / 30.7in Waterproof search coil diameter: 200mm / 7.9in Speaker or earphone jack: 1.2" Application: testing metal foreign body of raw-materials, fuel and food, detection of underground pipeline & line, archaeology, exploration, found buried treasures of gold, silver and metal artifacts, the acquisition of scrap metal industry, customs and safety inspection, detection of interpol search, checking metal foreign bodies in expressage and luggage. Package size: 470 * 210 * 100mm / 18.5 * 8.27 * 3.94in Package weight: 1350g / 3lb (type1)                            1200g / 2.6lb (type2)                            1420g / 3.1lb (type3)                            1620g / 3.6lb (type4) Note: The search coil is waterproof, but the control housing is not waterproof. The detection depth depends on the size of the metal. The larger the metal, the greater the detection depth. Taking coins as the standard, the detection depth is 16cm. Packing list: 1 * Metal Detector Main Unit 1 * Armrest 2 * Connecting Rod   1 * Search Coil 1 * User Manual 1 * Headphone