The Ground EFX MX 200 digital GPS metal detector features extremely durable fiberglass and polycarbonate construction with a large simple to use digital backlit interface, a quick release extension rod design that adds up to 14" and a 10" circular submersible honeycomb coil up to 36" deep. GEO-X GPS technology allows saving and locating up to 10 locations. There are 8 metal categories and adjustable discrimination, four elemination modes (all-metal, coin, jewelry, custom) and over 60 different elimination possibilities. The unit has four individual HD audio tones and signal strengh and depth indicators in pinpoint mode and can detect quarter sized coins up to 8" away. Adjustable arm guard with strap and external 1/4" phono headphone jack is included. Headphones and 8 AA alkaline batteries are not included.