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Product DescriptionEach 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). Six levels of adjustable discrimination. Running depth graph. Numerical target ID. Touch pad control interface. Modes include discrimination, pinpoint, and all metals mode. One alert tone. Overload alarm system. Preset ground balance. 8" open face coil.