How long does it stay lit at night?

Runtime depends on how much direct sun the panel gets during the day. On a full sunny charge it typically runs through much of the night, and less in overcast or shaded spots.

Does it need direct sunlight to work?

Yes, the panel needs direct sun to charge well. In heavy shade or under dense tree cover it will charge slowly and glow dimly or briefly.

It is built for outdoor use in garden beds and along paths, so it handles rain and normal weather. It is not meant to be submerged or left standing in deep water.

Push the stake into soil or mulch where the panel faces the sun, and that is it. No wiring, tools or outlet are required.

Does it turn on by itself?

Yes. A light sensor switches it on at dusk and off at dawn, so there is no timer or switch to manage.

Can I replace the battery?

The light runs on a rechargeable battery inside the housing. When output fades after a few seasons, check whether the housing opens for a battery swap before discarding it.