In it is a NDB 7A75 diode 4+ w's /G2 And the lens is a 8mm projector lens i found and machined the focus adapter to press into the lens making it a single focus laser . And surprisingly it burns a tee shirt at 32Ft in 5 sec. I was impressed with the results. I had the diode hanging out for a long time in the anti bag it was in. I bought them when Jordan was selling them some time ago.The host takes 2-18350's and is a eugumus host that i never built like so many others just laying in the cases.