This detector includes the best features of the world-famous ACE 250 but adds a powerful new DD searchcoil, enhanced iron discrimination and a higher frequency. Enhanced Iron Resolution™: allows more control of iron discrimination levels; helps separate good targets from adjacent junk iron. Powerful new Double-D searchcoil: provides greater detection depth and performance in mineralized grounds and excellent scanning coverage. Other features: One-Touch operation; 3-piece travel/storage, disassembles to 24″; adjustable arm cuff; quarter-inch (1/4″) size headphone jack.