Carts, liquidizer and batteries.
Edit: they did resolve this issue and refunded the price of the batteries. Amended my review to reflect customer service as it was good. Bought a pack of cartridges, liquidizer and 2 510 batteries, {the cheapest ones they have albeit) and the batteries did not work at all, ended up just buying 2 new batteries at a local vape shop. Left a review on the batteries a few days ago, the review I wrote is still not visible and they have not tried to contact me about resolving this issue. As far as I can tell the cartidges are working great, but they are literally identical to the Chinese ones from Amazon and Ebay for a third of the price. The liquidizer is the best I've found out of 3, but it is PG based which will turn it brown over the time you use it and will start to not taste so good, but that is the only thing I will probably continue to buy from them.