SOOOOO quite a while ago i ordered a BLU starter kit....needless to say i havent received it yet....Blah....anyways in the meantime i have ordered a 510 kit from innovapor and have been doing some reading.....one thing i cant figure out is what exactly IS a usb passthrough.....and how does it hook to my e cig? do i still have a battery connected? CONFUSED!!!!! Thanks for all yalls help!