I believe it is just a firmware upgrade.The screen is the same size.As far as when screwing the cap on,that is when vamo comes up on the screen.
Also,in that pic,it only mentions and shows the puff time,you can also change that to show volts or watts instead.
Also,in that pic,it only mentions and shows the puff time,you can also change that to show volts or watts instead.
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