new vs old Tunze Wavebox...

[gobytron]

I have a line on a tunze wavebox from a friend who used it for about a year and then quit reefing.
it's about 3 years old all in all though and I have noticed people talking about the new vs the old versions of the tunze wavbox.

what are the differences?

if any knows or knows where I might look to find out, I would appreciate the shared info.....

thanks.
Goby