the unicon comes with a set of leads with crocidile clips attached you simply clip onto the car battery , power pack (12v) supply ect. the unicon does the rest we started off with the battery/ power pack (always make sure you have a back up) then we went up market to a petrol driven generator fill it with petrol stick it in a corner out the way that supplies 240v plug in its normal transformer to the unit ,bobs your uncle fannies yer aunty and any two's a pair.