Do these need wiring or a power outlet?

No. Each light has its own solar cell and battery, so you push the stake into the ground and leave it in sun. No outlet, transformer or cable is needed.

How long do they stay lit after a full charge?

Runtime depends on how much direct sun the panel gets. On a clear day most owners of similar solar stake lights get several hours after dusk; on overcast days expect noticeably less.

Are they bright enough to light a walkway?

They are accent and marker lights, not area lighting. They outline a path or bed edge so you can see where you are stepping, but they will not illuminate a patio.

What does IP65 mean for garden use?

IP65 means protection against dust and against water jets from any direction. They handle rain and watering, but should not be submerged or left standing in deep puddles.

What is in the 12-pack?

Twelve individual stake lights, each with its own solar panel and rechargeable battery. No separate controller or hub is included.

Can I leave them out through winter?

They are built for outdoor use, but freezing soil and short daylight will cut runtime. Many owners bring solar lights in or store them during hard freezes to protect the batteries.