This is a nearly new LED light ring for macro photography. It comes with a 52mm thread (can be screwed in directly on the lenses with 52 mm filter thread), for smaller lenses you would need step-down rings from 52mm to the filter thread. It may work with larger threads with step-up rings, though I have not tried this myself.

The ring ligh comes with an AC adapter, but can also work autonomously with a 9V battery (not included).

Manufacturer's description below:

The Digi-Slave Mini L-Ring Ultra is a powerful, easy-to-use LED ring light ideal for macro photography.

This compact, lightweight ring light is perfect for any kind of close-up photography dental, catalog, jewelry, etc. when using cameras with lens threads up to 52mm.