It's not variable voltage, but it is a touch sensor with a sliding protector to cover it when not in use. Very slick design actually.
No variable voltage is disappointing but not a deal breaker for me. I have enough spare Precious-LV2's that I can afford to dismantle one to see what components the VV part involves. In fact, right now I am soaking one of the Precious tops in a mild solvent that will slowly eat away at the epoxy which is holding the electronics together. Pretty sure I can decipher how it works and obtain the necessary parts, already did that for the Precious-L1's.