Those modules work good. Every time I order them, they have holes on the ends, not the side ... but they are nice. They are 20-30% thinner than SS modules and about 1/2 the price. They are 4-wire and 12v. I run mine off 12v LiOn batter packs. I think one pack can run 20 of them, but I've been doing most of my testing with 10 ... and they run hours and hours.