I bought 3 of these units when he had the non-functioning ones.
They have a lot of potential even if they aren't working. Unfortunately he has sold out of the 'broken' ones and only has the functioning ones for a higher price.
Yes, very straight forward, you get a cord with a wall plug, and a female end. the PSU itself has a male end to connect to. can't miss it (and no wiring required).
Other then that, everything you need to get it running will be supplied by the seller... however IIRC, regardless what unit you get. "non-funcitoning" or "functioning"... both will have fairly poor divergance without adding a collimator lens.. beyond that, its your call.