e-cig product numbers confusing

[VP2008]

There are so many types of ecigs available now and it seems that each type also has different product numbers. This is very confusing. What are these numbers for and can someone provide a link to a picture or description for each? And I'm sure there are more besides these. Which are pens, minis, super minis, etc. When someone posts about a product with just a number and no link to a picture or description, I have no idea what they're talking about.

Thanks in advance.

DSE901
901B
DSE101
DSE103
M201
M204
KR808
RN4072
RN4081
Mini fogger