Someone please clarify something for me? Is the smok BOLT a "mechanical" mod or is it not? I can't figure it out. I see the vendors talking about it having a "mechanical button"...but that doesn't necessarily mean it's really mechanical. I see on some of the Alibaba descriptions a reference to "Patent PCB". Now...if it's fully mechanical...what is with the PCB???? Can anyone definitively clarify this for me? It BOLT a fully mechanical mod, or does it just have a mechanical switch? TIA!!!!