Why Do We Not See More U.S. Detectors With Selectable Frequencies?

[EL NINO77]

Whites and SpectraV3,V3i.. it's timeless metal detector and pattern for other detectors.... he got into a certain disadvantage at the beginning  -that had to refrain from being able to simply update the firmware ...Because updating detector software makes it possible to quickly and cheaply eliminate the deficiencies, even greatly improve work detector detection and also flexibly respond to market demands-and dramatically extend the lifetime of the top product-to the highest quality detection for many years ...