Gosh, I haven't the foggiest! It was a starter kit and that's all I know. I have a purple thing for the liquid too.
At some point you will have to change the clearomiser, usually around the 1 week mark. If you have the one I think you have, you buy replacement heads, take it apart and swap the head.
If you find your ecig is not working great or tasting bad/burnt, you'll know what's up.
Vision eGo CE5 V3 Heads - Ecigwizard.com