The firing button is almost flush with the body but has a very sensitive press, I have on occassion when distracted by something found pressing down on the body and then looking to see why it did not fire. this was rarely the case however. I have found that the more I use this mod, the better I like it. Being able to personalize the vape ising the nickel purity feature is in my opinion the very best frature of this mode. I applaud SXK for maintaining this feature. I have recently ordered the SXK 200 watt Nebula box that I hope incorporates this feature.The button is very low profile and easy to press, I don't understand what you mean by the side of your thumb but I don't see it being an issue.
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