Features: ALL METAL & DISC Mode: ALL METAL mode is used to find all types of metal objects in the ground. And DISC mode for eliminating unwanted and trash metal objects(e.g. nails, foil, pull-tabs) from detection. Headphone Jack: detector designed with 1/4" headphone jack for connecting with headphones(included) with a stereo plug. Using headphones not only allows you to hear subtle changes in the sound more clearly, but also prevents the sounds from bothering bystanders. Waterproof Double-D Search Coil: allow you to operate in the shallow water, 11-inch(286mm) large size with high accuracy for more stable performance. Ground Balancing: help to cancel the unwanted signals coming from the ground minerals while still detecting the signals from buried metal objects. 2-tone Audio Discrimination: once the metal finder detect something, it will sound 2 types of sound for different types of metal. Sensitivity Adjustment: after you become familiar with how the detector works, it is important to fine tune the sensitivity to get better detecting effect. Pinpointing the Target: after detecting the metal, the function help to accurately pinpointing the target to make digging easier. Easy to Assemble & Operate: metal detector is easy to assemble, no tools are required. When detecting, keep the search coil parallel to the ground, then sweep it from side to side slowly. Height Adjustable: user-friendly stretchable rod, allows the operator of different heights to adjust the detector to the desired position for comfortable using. Power Supply: just powered by 1pcs 9V 6F22 alkaline battery, or the nickel metal hydride rechargeable battery, low power consumption, low power indicator. Wide Applications: apply in gold/silver/copper/iron/metal/coin/cultural relics detection in desert, beach, grassland, archaeological site, etc. Specifications: Type: Detector Only / With Backpack + Headphone (Optional) Material: ABS Mode: DISC, ALL METAL Headphone: Impedance: 32 Ohms Frequency Response: 20~20,000Hz Maximum Power Input: 100mW Sensitivity: 108dB 3dB Right Angle Stereo Plug: 1/4" (6.3mm) Cable Length: 4.1"(1m), 82"(2.1m) when fully extended Power Supply: 1 * 9V 6F22 battery (NOT included) Screen Size: 79 * 51mm / 3.11 * 2.01in Search Coil Size: 286 * 222mm / 11.26 * 8.74in Adjustable Height: 1070~1290mm / 42.13 * 50.79in Backpack Weight: 427g / 15.05oz Headphone Weight: 186g / 6.56oz Detector Weight: 1189g / 41.96oz Package Weight: 1720g / 60.70oz(Detector Only), 2384g / 84.11oz(With Backpack + Headphone) Package Size: 54 * 21.5 * 13.5cm / 21.26 * 8.46 * 5.31in Packing List: 1 * Detector Control Unit 1 * Search Coil 2 * Rod 1 * Headphone 1 * Backpack 1 * Manual (English)