I'll let Monte fill you in on the technical stuff-but it is a coinshooter sublime! I rotate the Notch level knob in regular discriminate until the two tones blend at pulltab and then I have a 3-tone machine! Nickels have the low tone, tabs (and rings) have the mixed tone, and higher coins have the high tone. In this mode it is super! The notch mode is very good, also, but there is a chance for masking-but in high trash areas it is a godsend. It also has an ACCEPT mode that I hardly use, but if you want to only find a particular object this is also great. The depth blanking is the only thing that I cannot understand why anyone would want to use. I do wish it had ED-120 instead of something less. It seems to have a slightly faster recovery speed than my Silver umax.