okay, so just get the chameleon and I'm good to go with the 801? Geez
hey Frank I know this world can be confusing but once you get it down, it will all start unfolding into a beautiful vaping world of options and hobbies.901 is compatible with KR808 801 is wider than 901 can be used with a fusion cartomizer. A 510 is the complete opposite of both using a male connection and can be.used with a 306 model or any 510 cartomizers.