It heats weed by hot air. The metal plates vapes are shite dont buy one you might aswell burn the money lol.

I find the size really good the size of a coke can.

Its hard to explain where you put the weed in. But if you can see in the pic the metal tube like thing thats where you put the weed and it sits on a gauze and theres a light under it that heats it.

It sends out a shit load of vapour but takes about 5 minutes to heat up (less than skinning a joint I think lol)

Doesnt smell either.

Hope that satisfys your need but anything elseyou wanna know about them just post it here.