I'm not sure sure. They have stacked 26650s in 'em and a slider pot to set voltage. Some guy brought 'em into the shop where I regularly buy juice and I asked him if I could take a picture. I didn't have an XPV with me but stuck my 18650/dna bottom feeder in the foreground for scale.LMAO Rossum!!! What in the name of all that is holy are those things?