Garrett Ace 350 Handheld Metal Detector  DD Coil + Headphones Enhanced Iron Resolution: allows more control of iron discrimination levels; helps separate good targets from adjacent junk iron. Powerful new Double-D search coil: provides greater detection depth and performance in mineralized grounds and excellent scanning coverage. Higher Frequency: offers improved ability to detect both small (i.e. small gold nuggets) and large targets Volume Control Headphones: included with purchase Electronic Pinpointing: to precisely locate target and speed recovery Accept/Reject Discrimination: to modify discrimination patterns Five Search Modes: select pre-set discrimination pattern or create your own Continuous Coin Depth Indicator: to determine target depth Battery Condition Indicator: shows battery life continually Interchangeable ACE series search coils: are available Other features: One-Touch operation; 3-piece travel/storage, disassembles to 24"; adjustable arm cuff; quarter-inch (1/4") size headphone jack.