After the first charge and changing the cartridge it leaks all the time. Worst o the market, especially when they claim they don't leak. Changed cartridge for different flavours, all leak. Waste of money. I hope Vype read this review and send a pen that works. If you read this I strongly advise you not to buy. You will end up with a mouth of nicotine fluid. Not nice experience. Enough to send you back to cigarettes. Trading standards will be informed.