I don't quite get why all the PVs seem to have LED's. I can see why you might want a red one with an analog look alike, but other than making them look more like an analog (or less with blue/purple etc) do they actually serve any kind of purpose? I know a friend of mine got the m401 & has a red LED for when he's outside vaping & doesn't want to answer a million questions & a blue one for when he's places where smoking is forbidden. Wouldn't it be simpler to just do away with them altogether?