Penru (sir or Ms.?) those are the different types of connection for ecigs. The 3 most heavily used are the 510, 808, & 901. There are quite a few differences in each type from airflow, voltage, to mah. Hope this helps somewhat.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.