How tall is it, and how much of that is above ground?

It stands about 37.8 inches overall, with a 4.49-inch square footprint. Most of that height is the stake and post, so the light sits high for a pathway fixture.

Does it need wiring or an outlet?

No. It is battery-powered and charged by its own solar panel, so you just push the stake into soil or mulch in a spot that gets sun.

How many lights come in a pack?

One. Each pack is a single lamp with one bulb, so a long walkway needs multiple units.

Will it stay lit through the night?

Runtime depends on how much direct sun the panel receives. In full sun it should run for several hours after dusk; in heavy shade or short winter days, expect less.

Is it safe in rain and snow?

It is made for outdoor use, but the listing gives no formal weather rating. In areas with hard freezes, many owners bring solar path lights indoors for winter to protect the battery.

Can I replace the bulb or battery?

It uses one bulb, and solar path lights of this type usually have a small rechargeable cell behind the lens. Check the fixture for an access cover before buying if replacement matters to you.