Never seen one of those before

yea interesting model 

in my collection few more but this WHITE is uniq

more power  2 bat

special for learning or speach repeating

but head is same like in wm-101

lightweght body nice plastic like soft touch

many additional functions

but bigger than 101

So, tell me again, what are the extra buttons for and what do they do exactly?

auto repeat

and repeat mode 

synhro

I really like this unit.  It has stereo output, right