Technical data and features: (without guarantee, as the exact production year is not known and no operating manual is available) Waterproof and interchangeable 22.5cm Double-D search coil. Operating modes: All metals (Silent Motion). Discrimination of iron (adjustment of iron volume to zero, without depth loss!). Operating frequency 18 kHz. 3-tone discrimination (iron = low, non-ferrous and precious metals = medium-high and high). 3-stage ground balance. Integrated...