Manual is here;http://www.universal-radio.com/catalog/morse/1324om.pdf
Basically you plug a set of iambic paddles into it and it into the rig.
It is great for an older rig that does not have electronic keying circuitry built into it.
Most all do these days.
Some might use one anyway as it may allow more flexibility with memories, different types of keying and other preferred settings.