Major Specification: Biggest Explore Depth:1.5m Features: 1.Metal scan & Metal type mode switchable 2.Metal & mineral detection 3.Ferrous & Non-ferrous metal discrimination 4.Auto calibration when turn on 5.Manual Eliminate Mineralization 6.Speaker indication 7.Headphone jack option 8.Low battery indication 9.LED back light option 10.Lead wire disconnection alarm Introduction:This high performance unit harnesses the power of advanced technology provide with ground balance function to measure ground mineralization and adjust itself for optimum operation, addiction the metal type mode identify the detected subject in ferrous or non-ferrous metal, enhance the detection depth & accuracy effectively. AR924 is easy to operate, in order to take full advantage & functions of metal detection, please carefully read this instruction thoughtfully.