Garrett At Pro Metal Detector - Professional Treasure Hunter's Detector W/8.5" X 11" Coil, Free Headphones 4 Free Bonus Items Pro Mode Audio: Proportional Audio and Tone Roll Audio features allow the user to hear characteristics of a target as they would in a True All-Metal Mode. High-Res Iron Discrimination: Use touchpads to set iron discrimination in one of 40 levels for precise ability to separate good targets from trash. Digital Target ID: 0 to 99 Target ID scale offers increased ability to distinguish one targets conductivity from another. Iron Audio: Allows the user to hear discriminated iron and to alter the detectors mid-tone signals range. Fast Recovery Speed: Allows greater ability to pick out good targets amongst trash.