Whites Eagle Spectrum.  25 year old technology and still can run circles around a lot of newer detectors. Stock programs and custom program slots.  VDI display, ferrious and non-ferrious signal graph display, Just about every adjustment can be made.  SAT, SAT speed, Audio discrimination, Mixed mode audio, AC/DC sensitivity, backlighting, auto/manual ground balance, VCO, recovery speed adjust, Iron rejection settings and lots more.  Also, one of the few detectors that can notch out (accept/reject