the SK-2F, (SK-2 mixer with Focus Fader). The Focus Fader is a true
optical crossfader, which was designed by DJ Focus. This true optical
crossfader is the worlds first to be used in a DJ mixer, and
has numerous advantages over regular faders, such as:
Besides the fader,
some other features differentiates this mixer from the original SK-2,
information, visit their web site at http://www.stantonmagnetics.com/.