Whats in the box???

[Erwin]

Hi all, my dad got this from a friend years ago and he gave it to me, I have no clue what it is.
I see its got one input and output or 2 inputs, dont know, never been used, please help...

https://postimg.cc/gallery/TT3vvsR

 

[Zilch]

 

[Erwin]

 

[fredeb]

 

[dan duette]

 

[dan duette]

 

[GECO]

 

[Zilch]

 

[chrisc]

 

[Erwin]

 

[GECO]

 

[Erwin]

 

[GECO]

 

[Erwin]