This is a USB rechargeable flashlight that also functions as a keychain. Please note that this is an older model, so the charging cable is MicroUSB. It has a high light output and is multi-functional for its size. It features not only a regular light mode but also a side light that can be used like a lantern. It also has a ring for hanging. It also glows in green. There is also a mode where the light turns red, and it also flashes, which is useful when walking around at night or in emergencies. Since there is only one button, you can switch between these functions by pressing it twice, three times, or holding it down. By attaching the included clip to the main unit, you can attach it to the brim of a hat and use it as a headlamp. Although not an included accessory, I will also include an unused MicroUSB cable. I purchased this about 3 years ago, so the battery is likely degraded compared to when it was new. I rarely used it, and it was kept in a key case, so I would find it dead and recharge it...repeatedly. Please understand that this is an older item before purchasing. Brightness (lumens)...650