Pretty easy to put together had to ask for SMD LED polarity but once that was decided all went pretty smoothly. It's taking me a while to do this, so it may not take you that long to finish. I run it with a 6v 2 button battery holder also purchased from Revain and it's nice and bright. Polarity if you're not sure, the cathode goes to a solid white stripe (on top of the blue ones and red LEDs), all LEDs are positioned in the same way. (connector plug top left as it should be, cathode top)