This is an upgrade of the bubble vaporizer, it's kind of like a cross between the tube vaporizer and the bubble.
It looks like a normal pipe, however you do not burn the contents, you heat the bubble part from underneath with a lighter or candle (saves butane!), and it will vaporize the contents. You then shake the vaporizer, and heat again whilst inhaling on the tube.
The flaws of this product are similar to the tube and bubble vaporizer, you have to be careful that no combustion occurs.
However it is a useful and cheap vaporizer and would be particularly good if you need to vaporize on the move.