That part is the atomizer that is specifically designed for vaporizing pure cannabis oil that you would find at a dispensary. Pure meaning not mixed with vegetable glycerine or propylene glycol like some oils that come pre-mixed similar to an e-cig juice. It screws into the boxy device in the first link which is the "brain" that takes the battery and delivers a current to the atomizer. Most of the Cannabis vaporizing technology is based on stuff made for the e-cig world, so that's where the box comes from.
In general if you buy a vaporizer directly from a dispensary it will be pretty overpriced for what you get, and they will probably try to sell you one that will lock you into buying pre-mixed (vegetable glycerine / propylene glycol + cannabis oil) cartridges from a specific company. This can be convenient, but personally I prefer to use a vaporizer that is more flexible in terms of what you can use it with.
For example I also got this attachment for the same box:
/www.fasttech.com/products/0/10016096/3172400-authentic-uwell-crown-sub-ohm-tank-clearomizerThis part would screw on in place of the pure oil atomizer, and allow me to use a blend that I make by mixing pure Cannabis oil with propylene glycol. This type of atomizer would allow me to vaporize for days without needing to refill, whereas the pure oil atomizer needs to be refilled fairly often.
Vaporizer technology can be a bit confusing at first but those so inclined will save a lot of money and end up with a superior device by first doing a bit of research (see the link to the forum I posted above) and ordering directly from China where they are all made (fasttech).
Post Edited (project) : 12/21/2015 9:16:35 AM (GMT-7)