The Univox Super Fuzz is an overdrive pedal designed for use with electric guitar. I've only used the pedal with electric guitar, but it can certainly be used with bass or electric piano if you so choose. This pedal is made up of all analog parts and has standard 1/4" TRS connections. It isn't in rackable form as it is a foot pedal.
The make up of the Univox Super Fuzz is very straight forward. It just has two knobs that control balance and expander. It also has a tone switch that has two different positions. Clearly, this is a simple configuration and should be one that most will find easy enough to use without the help of a manual.
The sound of the Univox Super Fuzz is one that is all its own. There are certainly a lot of fuzz and distortion pedals out there, but to date I haven't heard one that sounds quite like the Super Fuzz. There is a good reason that this was used by so many people - it has a classic, raw, overdrive sound that is great for playing both rhythm and lead guitar parts. I've used the pedal with a Fender Stratocaster and the '76 Fender Twin Reverb, and I feel that any type of vintage amp mixed with this pedal is an overall stellar combination!
At this point, the Univox Super Fuzz is a pretty rare pedal. They are highly sought after and will cost you a good amount of money to get a used one. Having said this, you're getting a one of a kind pedal that was a favorite of many guitarists before you. Even if you don't own one like myself, if you ever see one of them out there for sale or in the studio, check it out as this should be a pedal that guitarists are aware of!