Be careful not to pull any wires loose. Pull on the rubber end stopper (it's pressed in) to expose the switch assembly (that's enclosed in a case, just separate the halves). I needed a magnifying glass, but I could see a tiny rubber/plastic tube with a wire through one end. I started prodding it with a paperclip. I soon saw the tiny tube "recoil" into a hole. I GET IT!!! When you draw on the unit it pulls the tube towards you. The wires make contact with the metal contacts: ELECTRICITY!!! Of course, I gently pulled on all wires making sure they were connected.

I received item 2 days after ordering. Works in the car, but at a lower voltage. On the computer, the vapor is so warm I can barely inhale it. Tons of vapor production. Truly amazing, I wouldn't say it otherwise. Works best with blank cartomizers bought off this site.

I didn't know how nice it would be to not be juggling batteries after work every day getting a few drags here & there b4 one died. As a very recent analog user nothing makes me want to go back to them like not having my nicotine when I want it:) Fast shipping was great & this changes how I vape. The batteries are only for out & about now.