How does the fingerprint lock work?

You enroll your fingerprint on the sensor, and the arc only fires for a recognized print. That keeps children or other unauthorized users from igniting it. You will need to keep at least one enrolled finger working, since a failed read means no arc.

Is it actually windproof?

Yes. An electric arc has no flame to blow out, so it ignites in wind that would defeat a butane flame. It still needs the target wick or tinder in direct contact with the arc.

Can it light cigarettes or a pipe?

Not well. Arc lighters are designed for candles, stoves and campfire tinder; the arc does not draw through tobacco the way a flame does. For smoking, a jet or soft-flame lighter is the better tool.

How do I charge it and how long does it run?

It charges over USB with the included cable. The listing does not state a runtime or charge time, so plan on topping it up before a trip rather than trusting it after long storage.

What comes in the box?

The lighter, a USB charging cable and a user manual. No wall adapter is included, so you supply your own USB power source.

Is it safe to keep around kids?

Safer than an unlocked lighter, because the arc needs an enrolled fingerprint. It is not childproof in the certified sense, so still store it out of reach.