Most support solar charging plus built-in or removable rechargeable batteries, and many also offer USB charging (including USB‑C) so you can top up either from the sun or from a cable.
Common features include multiple brightness modes (high/medium/low) and multi-mode lighting. Some models include remote controls, and many have automatic dusk‑to‑dawn sensors for hands‑off operation.
Some outdoor solar string lights list ETL (or similar) certification for outdoor use, while other listings explicitly note that certifications are not provided or listed in their details.
Extras vary by item but can include remote controls, USB‑C charging ports, ground stakes, mounting hardware, included bulbs, and printed instructions.
Reported outputs in the available details range from about 60 lumens for small lanterns up to around 150 lumens for some string‑style bulbs. Some lanterns also list a maximum light distance (for example, about 9 m).