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Alter 71+ Rutus the metal detector from the future, is now with 3 mode of use, motion, static and mixed, and with 7 preprogrammed type of search, the most advanced graphic/vector display with vdi, and many others modern technology, multi/variable working frequency ec..ec.. The name "Alter 71+" - from the Latin "other" and the number 71 represents the number of available frequencies. Alter 71+ is probably the world's first metal detector that will have a smooth tunable frequency. The detector is tunable from 4.4 kHz to 18.4 kHz increments of 0.2 kHz - without the need to replace the probe. Noone detector on the market can't.