Each Greek Family model has selectable notching capabilities, adjustable sensitivity, depth readout, a battery life indicator, and 1/4 and 1/8 head phone jacks. Each metal detector operates at 7.8 kHz transmission frequency and runs on one 9V alkaline battery (not included). 65 levels of adjustable discrimination. Frequency shifting to eliminate interference. Ground mineralization readout. Continuous on screen operation status. Phase error readout. Touch pad and knob control interface. Modes include discrimination, pinpoint, and all metals mode. Expanded iron range. Manual ground balance with computer assistance. Four tone alerts. 10" concentric elliptical search coil for superior pinpointing and wider sweep. Ergonomic pistol grip. Arm strap.